Cordy, J.
This is a consolidated appeal from the separate orders of a single justice of the Appeals Court and of a full panel of the Appeals Court concerning the award of attorney’s fees and litigation costs to the defendants. After a jury-waived trial, a Superior Court judge granted the defendants’ motion for fees and costs under G. L. c. 231, § 6F, finding that “substantially all, if not all, of the plámtiffs’ claims were wholly insubstantial, frivolous, and not advanced in good faith.” A single justice of the Appeals Court vacated the award. We granted the defendants’ application for direct appellate review. In addition, we granted the defendants’ application for further appellate review of an order by a full panel of the Appeals Court denying the defendants’ motion for appellate fees and costs under G. L. c. 211A, § 15, and Mass. R. A. P. 25, as appearing in 376 Mass. 949 (1979), arising out of the merits appeal of this case,
Fronk
v.
Fowler,
71 Mass. App. Ct. 502 (2008). We conclude that the plaintiffs’ claims were frivolous and insubstantial. Consequently, we reinstate the fees and costs awarded by the trial judge and we remand to the Appeals Court its decision so that it may exercise its discretion with respect to appellate fees and costs.
1.
Background.
We draw the following from the findings of fact issued by the judge at the close of the trial. Those findings, having been described as “fully supported in the record,” and affirmed by the Appeals Court,
Fronk
v.
Fowler, supra
at 503, are conclusive and “unassailable” in this context.
Danger Records, Inc.
v.
Berger,
444 Mass. 1, 12 n.11 (2005)
(Danger Records).
a.
The limited partnership.
In 1984, the defendants, Robert L. Wolff, Jr.; John P. Fowler; and Jeffrey A. Millman, established The Cambridge Company, Inc., for the purpose of engaging in the real estate business.
Through The Cambridge Company, the
defendants identified properties to develop and created individual limited partnerships to acquire them. In 1985 they entered into a purchase and sale agreement to acquire a commercial property located at 23 East Street in Cambridge, a former hot dog factory, which they planned to renovate and lease. Consistent with their business model, their plan was to form a limited partnership that would assume ownership and management of the property.
Concurrent with their negotiations to purchase the 23 East Street property, the defendants entered lease negotiations with the plaintiffs, Ed Walter, Jack Saltiel, and Robert Fronk, who were the principals of Compumart Corporation. The plaintiffs were interested in leasing three floors of the building for their business operations. Over the course of the negotiations, the plaintiffs expressed interest in acquiring an ownership interest in the limited partnership. The defendants agreed, and in exchange for a fifteen-year lease and a $500,000 letter of credit to be used for project cost overruns, they entered into a limited partnership agreement with the plaintiffs creating the Maple East Associates Limited Partnership (MEALP). The defendants were the general partners of MEALP and held a sixty per cent interest in it. The plaintiffs were limited partners, possessing a forty per cent interest.
Throughout the negotiations, the defendants made it clear to the plaintiffs that they would continue to acquire other properties outside the partnership.
The partnership agreement included the following terms. Section 4 set out the limited purpose of MEALP:
“The purpose of the partnership shall be (i) to acquire
approximately 32,268 square feet of land and the six story concrete building thereon located at 23 East Street, Cambridge, Massachusetts (the ‘Property’); (ii) to renovate such building in such manner as the General Partners shall determine (the ‘Project’); (in) to own, operate and manage the Project; and (iv) to lease, sell, acquire or otherwise deal with the Project and other real estate in such manner as the General Partners shall determine.”
Section 5 authorized the defendants, as general partners, to acquire property in furtherance of MEALP’s limited purpose:
“In furtherance of its purpose,
but subject to all other provisions of this
Agreement, the partnership is authorized to: . . .
“5.2 acquire by purchase, lease or otherwise any real or personal property which may be necessary, convenient or incidental to the accomplishment of the purposes of the partnership;
“5.3 own, construct, operate, maintain, finance, improve, sell, convey, assign, mortgage or lease any real estate and any personal property necessary, convenient or incidental to the accomphshment of the purposes of the partnership” (emphasis added).
Significantly, the defendants were not required to make such acquisitions, and the authorizations in § 5 explicitly were subject to other provisions in the partnership agreement. One of those provisions was § 13.2:
“It is expressly understood that a General Partner may engage in any other business or investment, including the ownership of or investment in real estate and the operation and management of real estate, and neither the partnership nor any of the partners thereof shall have any rights in and to said businesses or investments, or the income or profits derived therefrom.”
Therefore, although authorized to acquire real estate “convenient” to the purpose of ME ALP, the defendants were also free to continue their separate real estate business.
Finally, § 12.5 of the partnership agreement anticipated that
the defendants would use their respective skills to provide services to MEALP but required them to charge “terms and conditions which [were] not materially less favorable to the partnership than the terms and conditions which would be available from unrelated parties,” that is, market rates.
On the same day that MEALP was formed, the defendants obtained a $5.3 million mortgage on its behalf, guaranteeing the debt personally.
Consistent with the partnership agreement, MEALP paid Fowler’s firm for its role in securing the mortgage. The fees paid were “in accordance with industry standards.” MEALP also paid fees to Millman for his services as architect and project manager. Again, the fees were market rate. Pursuant to its fifteen-year lease with MEALP, the plaintiffs’ company moved into 23 East Street in January, 1986. However, in December, 1986, the plaintiffs’ company went bankrupt and defaulted on its lease. It vacated the building in 1987.
The default cost MEALP hundreds of thousands of dollars. Nevertheless, the plaintiffs remained limited partners in MEALP.
The defendants continued to manage MEALP over the next decade, saving it from failure several times and successfully refinancing the property to reduce the debt burden by approximately $1.5 million.
MEALP paid fees to entities related to the defendants for various necessary services over this time, all of which were at or below market rates.
Separately, the defendants also continued to grow their real estate portfolio. In 1994, they created a new investment partnership to acquire two warehouse-type buildings at 9 East Street in Cambridge, and in 1997 they acquired another warehouse at 1 East Street, again through the creation of a separate investment partnership. The defendants did not invite the plaintiffs to participate in either of these ventures.
In 1998, the defendants were approached by Charles E. Smith Residential Realty LP (Smith), a publicly traded real estate
investment trust that was interested in purchasing the defendants’ properties at 1 and 9 East Street. Smith had no interest in MEALP’s 23 East Street property, but the defendants insisted the property be included.
Smith agreed to purchase all three properties for $28 million, which included an $8 million price for 23 East Street, not accounting for the debt on the property. This was an “extremely favorable” price.
As a consequence, the plaintiffs — who parted with nothing to acquire their partnership interests in MEALP and who contributed no time, energy, or capital toward the management of its property — collectively received $921,600 as a result of the sale.
b.
Complaint and trial.
Notwithstanding the apparently favorable outcome, the plaintiffs filed a complaint against the defendants alleging breach of contract, breach of fiduciary duty, fraud and misrepresentation, misappropriation of business opportunity, and restitution.
The judge organized the contentions in the complaint into three categories. The first category consisted of the plaintiffs’ contention that the defendants denied them an opportunity to participate in the 1 and 9 East Street properties (business opportunity claim). In support of this claim, the plaintiffs asserted that the defendants were required to afford them the opportunity both under the terms of the partnership agreement and in accordance with their fiduciary duties as general partners. The second category included the plaintiffs’ contentions that the defendants had charged MEALP excessive fees during their
management of the property (related party transactions claim). The third category consisted of the plaintiffs’ contention that the defendants had materially undervalued 23 East Street in the sale to Smith (valuation claim).
After a jury-waived trial, the judge found in favor of the defendants on all three claims.
With respect to the business opportunity claim, the judge concluded it could stand on neither of its two legs. First, she found that the defendants did not commit a breach of the partnership agreement because it clearly permitted the defendants to pursue other real estate business opportunities without the plaintiffs. Second, she found that the defendants did not violate their fiduciary duty with respect to such opportunities because the parties had shaped that duty in the terms of the partnership agreement and, regardless, the purchase of 1 and 9 East Street properties was not a business opportunity of MEALP because it was not related to the limited purpose of the partnership. See
Durfee
v.
Durfee & Canning, Inc.,
323 Mass. 187, 198 (1948) (“acquisition of the property must be . . . within the corporate purpose”);
Haseotes
v.
Cumberland Farms, Inc.,
284 F.3d 216, 228 (1st Cir. 2002), citing
Durfee
v.
Durfee & Canning, Inc., supra
(“Normally, a corporate opportunity is thought of as a business or investment opportunity within the sphere of, or somehow related to, the corporation’s own activities”). The judge further found that because the business opportunity in question, had it existed, would have belonged to MEALP and not the limited partners, the claim could only have been brought derivatively on behalf of the partnership, not on behalf of the limited partners themselves. See
Smyth
v.
Field,
40 Mass. App. Ct. 625, 629 (1996). With regard to the plaintiffs’ related party transactions claim, the judge found that all the fees were reasonable.
Indeed, the plaintiffs stipulated that they would offer no evidence that most of the fees charged by defendant Fowler were unreasonable, and as for the rest of the fees, the plaintiffs offered no evidence that they were not market rate. Finally, the judge concluded that the valuation of 23 East Street
was reasonable, both in light of the defendants’ affirmative evidence and the complete failure by the plaintiffs to contradict it.
c.
Direct appeal.
The plaintiffs appealed to a full panel of the Appeals Court, which affirmed the decision of the judge.
Fronk
v.
Fowler,
71 Mass. App. Ct. 502 (2008). The Appeals Court largely adopted the judge’s reasoning with regard to the valuation and related party transactions claims.
Id.
at 511-512. On the business opportunity claim, however, the Appeals Court expanded the rationale supporting the judge’s decision. Specifically, the court cited a recently decided case,
Chokel
v.
Genzyme Corp.,
449 Mass. 272, 278 (2007)
(Chokel),
and its predecessor,
Blank
v.
Chelmsford Ob/Gyn, P.C.,
420 Mass. 404, 408 (1995)
(Blank),
for the proposition that parties may shape their fiduciary duties by the terms of a partnership agreement.
Thus, based on different cases but affirming the same proposition, the Appeals Court held that the partnership agreement explicitly freed the defendants from any fiduciary obligation to offer the 1 and 9 East Street properties to the partnership.
Fronk
v.
Fowler, supra
at 507-508. The Appeals Court otherwise agreed with the judge that the 1 and 9 East Street properties were not related to the purpose of MEALP and that the defendants had not committed a breach of the partnership agreement’s terms.
Id.
at 509-511. The court did not address the question whether the plaintiffs’ fiduciary business opportunity claim should have been brought derivatively.
d.
Motions for fees and costs.
The defendants filed a motion for fees and costs at the close of trial, G. L. c. 231, § 6F. The judge granted the defendants’ motion before the plaintiffs’ direct appeal was heard by the Appeals Court.
Section 6F authorizes an award of reasonable costs and attorney’s fees incurred in litigation when “all or substantially all” of the opposing party’s claims are “wholly insubstantial, frivolous
and not advanced in good faith.”
If the judge finds that the claims meet that standard, “the statute mandates the award of reasonable counsel fees and other costs and expenses.”
Masterpiece Kitchen & Bath, Inc.
v.
Gordon,
425 Mass. 325, 330 (1997).
Here, the judge issued separate findings of fact and conclusions of law in support of her conclusion that the plaintiffs’ entire case was insubstantial, frivolous, and not brought in good faith. In reaching that result, the judge recapitulated the total absence of evidentiary or legal support for the plaintiffs’ case and concluded that it was “without even a colorable basis in law.”
Lewis
v.
Emerson,
391 Mass. 517, 526 (1984). Under the terms of § 6F, the judge was therefore bound to award fees and costs. She ordered materials and briefing from the parties concerning the proper calculation of fees and costs, and then awarded the defendants $1,161,375.10 in attorney’s fees and $69,546.16 in various costs.
The plaintiffs directed their appeal of the § 6F award to a single justice of the Appeals Court as required by G. L. c. 231, § 6G.
The single justice stayed the award pending a review of
the plaintiffs’ direct appeal. The appeal was decided on April 4, 2008, and we denied further appellate review.
The defendants also petitioned the Appeals Court for appellate fees and double costs in accordance with G. L. c. 211 A, § 15, and rule 25.
Unlike awards under § 6F, the Appeals Court has considerable discretion over when to award appellate
fees and costs, even if it concludes that the appeal was frivolous.
See
Masterpiece Kitchen & Bath, Inc.
v.
Gordon, supra
at 329-330;
Avery
v.
Steele,
414 Mass. 450, 455 (1993).
On December 16, 2008, both a panel of the Appeals Court and the single justice determined that the plaintiffs’ business opportunity claim was not frivolous and therefore that awards under G. L. c. 231, § 6F, and G. L. c. 211A, § 15, were not warranted.
We begin with our review of the decision of the single justice vacating the judge’s award of fees and costs under G. L. c. 231, § 6F. We then proceed to review the decision denying appellate fees and costs by the Appeals Court.
2.
Award under G. L. c. 231, § 6F.
General Laws c. 231, § 6G, vests the single justice with considerable leeway when reviewing the award or denial of § 6F fees and costs. The statute states that the single justice “shall review the finding and award, if any, appealed from as if [he] were initially deciding the matter, and may withdraw or amend any finding or reduce or rescind any award when in [his] judgment the facts so warrant.” G. L. c. 231, § 6G. “[T]he review is thus de nova in the sense that the single justice may draw his or her own ultimate conclusions as to the merits of a fee award,” although the single justice is bound by “the subsidiary facts as found by the trial judge” in her § 6F
decision unless they are without basis.
Danger Records, supra
at 9, quoting
Miaskiewicz
v.
LeTourneau,
12 Mass. App. Ct. 880, 881, 882 (1981). See
Hahn
v.
Planning Bd. of Stoughton,
403 Mass. 332, 337-338 (1988). In order to accomplish the statute’s goal of a “speedy decision,” the single justice considers an abbreviated record made up of the lower court’s § 6F findings and award, as well as other “relevant” materials. G. L. c. 231, § 6G. See
Miaskiewicz
v.
LeTourneau, supra
(single justice not required to review entire record). In this case, for example, the single justice reviewed the judge’s § 6F findings of fact and her trial findings of fact, as well as relevant portions of the trial record and limited briefing by the parties.
a.
Standard of review.
Our review of a decision of the single justice made under G. L. c. 231, § 6G, is “of extremely limited scope.”
Danger Records, supra
at 11. In addition to the broad grant of authority to perform a de nova review, § 6G states that the decision of the single justice “shall be final.” While this does not divest this court or the Appeals Court from reviewing the decision further according to the rules of appellate procedure, see
Bartlett
v.
Greyhound Real Estate Fin. Co.,
41 Mass. App. Ct. 282, 289-290 (1996), it does require a reviewing court to treat the “underlying [§ 6F] factual findings adopted and accepted by the single justice. . . as‘final’and. . . not themselves subject to further review.”
Danger Records, supra
at 12-13. Thus, we review the single justice’s decision only for abuse of discretion or other error of law.
Id.
b.
Plaintiffs’ business opportunity claim.
The single justice
reversed the award of fees in this case based on two conclusions of law. First, he determined that the language of the partnership agreement was sufficiently ambiguous as to give that aspect of the plaintiffs’ business opportunity claim a degree of foundation and therefore the breach of contract business opportunity claim was not frivolous. Specifically, the single justice concluded that the partnership agreement provision that authorized the defendants to make convenient acquisitions of real estate on behalf of MEALP clouded the meaning of the provisions that expressly authorized them to pursue separate real estate ventures and the provision that limited MEALP’s purpose to the acquisition and management of a single property. Second, he concluded that the plaintiffs’ fiduciary business opportunity claim, while unmeritorious, had been based on unsettled law, the uncertainty of which gave the plaintiffs a reasonable belief that their claim had a chance of success. Both conclusions were errors of law.
A claim is frivolous if there is an “absence of legal or factual basis for the claim,”
Demoulas Super Mkts., Inc.
v.
Ryan,
70 Mass. App. Ct. 259, 267 (2007), and if the claim is “without even a colorable basis in law.”
Lewis
v.
Emerson,
391 Mass. 517, 526 (1984). The proper vantage point for evaluating whether a claim is frivolous is from the time the claim was brought and over the course of the litigation. See
id.
In this case, both the breach of contract and fiduciary duty bases of the plaintiffs’ business opportunity claim were frivolous from the inception of the litigation.
We do not agree with the single justice that the plaintiffs adhered to a plausible interpretation of the partnership agreement. As the Appeals Court noted in its merits decision, the plaintiffs’ claim was based on a confined reading of the partnership agreement that emphasized the provisions authorizing acquisitions “convenient” to the purpose of the partnership. See
Fronk
v.
Fowler,
71 Mass. App. Ct. 502, 509-510 (2008). See also
Starr
v.
Fordham,
420 Mass. 178, 190 (1995), quoting
Boston Elevated
Ry.
v.
Metropolitan Transit Auth.,
323 Mass. 562, 569 (1949) (“Not only must due weight be accorded to the immediate context, but no part of the contract is to be disregarded”). But the acquisition of three large warehouses (the 1 and 9 East Street properties) was not convenient to the purpose of MEALP. See
Durfee
v.
Durfee & Canning, Inc.,
323 Mass. 187, 197-199 (1948);
Haseotes
v.
Cumberland Farms, Inc.,
284 F.3d 216, 228 (1st Cir. 2002). Nothing about the addition of three adjacent warehouses promoted the purpose of MEALP. Moreover, the defendants were not required to make convenient acquisitions; the partnership agreement merely authorized them to do so. The plaintiffs sought to transform a permissive grant of authority into a contractual requirement.
Most important, however, was the fact that the plaintiffs were urging an interpretation that placed the utmost importance on a provision of the agreement that was explicitly
“subject to
all other provisions” of the agreement (emphasis added). One of those provisions was an express understanding that the defendants could engage in “any other business or investment, including the ownership of or investment in real estate,” and that “neither the partnership
nor any of the partners thereof
shall have any rights” in such businesses or investments (emphasis added).
Where the surrounding facts are not in dispute, the matter of contract interpretation presents a question of law. See
Eigerman
v.
Putnam Invs., Inc.,
450 Mass. 281, 287 (2007);
Robert Indus., Inc.
v.
Spence,
362 Mass. 751, 755 (1973). Here, the language of the partnership agreement was wholly inconsistent with the plaintiffs’ position that the agreement directed the defendants to pursue large, unrelated real estate purchases on behalf of the partnership. The agreement imposed no duty on the defendants to do any such thing. As the judge found, the plaintiffs’ position was untenable and incredible from the start. The judge also found that the plaintiffs offered no evidence that they believed or could have believed that the defendants were required to do anything more than they did. These facts were grounded in the evidence adduced at trial or, more accurately, the plaintiffs’ inability to adduce any evidence. There was no basis to withdraw or amend these findings under G. L. c. 231, § 6G, and the single justice committed an error of law in concluding that the plaintiffs’ claim had any basis in law or fact. As a matter of law,
their business opportunity claim based on the language of the partnership agreement was frivolous.
The same holds true for the single justice’s conclusion that the plaintiffs’ fiduciary claim was not frivolous because the law was not “well settled” when the plaintiffs brought their claim in 2002. See
Pirie
v.
First Congregational Church,
43 Mass. App. Ct. 908, 910 n.3 (1997);
Strand
v.
Hubbard,
27 Mass. App. Ct. 684, 687-688 (1989). By his logic, it was not clear until 2007 that “[wjhen a director’s contested action falls entirely within the scope of a contract between the director and the shareholders, it is not subject to question under fiduciary duty principles” but, rather, is governed by the terms of the contract.
Chokel, supra
at 278. He stated further that the application of this principle to contracts between general partners and limited partners in a limited partnership required an
extension
of
Chokel
informed by Delaware law. See
Fronk
v.
Fowler, supra
at 507-508, citing
Sonet
v.
Timber Co. L.P.,
722 A.2d 319, 322 (Del. Ch. 1998) (“principles of contract preempt fiduciary principles where the parties to a limited partnership have made their intentions to do so plain”).
Without question, the decision of the Appeals Court in this case is the clearest statement to date in Massachusetts that the contours of fiduciary duties in a limited partnership are subject to contract. However, the proper inquiry with regard to the ftivolousness of the plaintiffs’ fiduciary business opportunity claim is whether the claim had a basis in law in 2002, that is, before
Chokel.
Chokel
did not announce a new rule of law; rather, it affirmed a long-standing rule in Massachusetts that “[wjhen a director’s contested action falls entirely within the scope of a contract between the director and the shareholders, it is not subject to question under fiduciary duty principles.”
Chokel, supra,
citing
Blank, supra
at 408. It relied on
Blank, supra,
which stated that fiduciary duties in a close corporation “do not arise when all the stockholders in advance enter into agreements concerning” those duties.
Id.
(dealing with fiduciary duties with respect to rights on termination and stock purchase). That holding, in turn, had origins dating even earlier. In
Donahue
v.
Rodd Electrotype Co. of New England, Inc.,
367 Mass. 578, 598 n.24 (1975)
(Donahue),
we said that stockholder duties to one another can be altered by
provisions in a close corporation’s articles of organization, the corporate bylaws, or a stockholder agreement. Similarly, in
Evangelista
v.
Holland,
27 Mass. App. Ct. 244, 248-249 (1989), the Appeals Court said that “[questions of good faith and loyalty do not arise when all the stockholders in advance enter into an agreement” regarding those duties. It has likewise been clear for some time that the doctrine of the
Chokel, Blank, Evangelista,
and
Donahue
cases applies to limited partnerships. For example,
Blank
recalled that “a close corporation resembles a partnership.”
Id.,
citing
Donahue, supra
at 587. See
JRY Corp.
v.
LeRoux,
18 Mass. App. Ct. 153, 166 (1984).
In determining that the plaintiffs’ business opportunity claim was not frivolous, the single justice pointed to the rationale used by the full panel of the Appeals Court in rejecting the plaintiffs’ appeal on the merits. Unsurprisingly, that decision made use of
Chokel,
our most recent articulation of the law on the subject in question. However, the Appeals Court also cited
Blank,
signaling its awareness of the underlying doctrine. Had we never decided
Chokel,
the Appeals Court would have had ample authority to hold against the plaintiffs. With respect to the proposition that the rule in
Blank
and
Chokel
applies to limited partnerships, the Appeals Court cited a Delaware case,
Sonet
v.
Timber Co. L.P., supra.
That proposition was also well founded in Massachusetts law. The law of corporations and the law of partnerships have evolved together. See
Blank, supra
at 408 (with regard to fiduciary duties, “a close corporation resembles a partnership”);
Partnership Equities, Inc.
v.
Marten,
15 Mass. App. Ct. 42, 48 (1982) (“We have remarked ... the affinity of purpose between the limited partnership and the business corporation. The status of a limited partner as analogous to that of a stockholder has not gone unnoted by courts and commentators. . . . It is appropriate, therefore, to look to cases involving stock subscriptions for assistance in measuring the extent of obligation of a subscriber to a limited partnership” [citations omitted]). In 2002, a claim that asserted that the unambiguous terms of a partnership agreement had no bearing on the partners’ fiduciary duties had no basis in the law of Massachusetts and was frivolous.
c.
Further consideration of the plaintiffs’ case.
We turn now to the question whether the remainder of the plaintiffs’ case was wholly insubstantial, frivolous, and not brought in good faith.
G. L. c. 231, § 6R Although the single justice limited his discussion to the language of the partnership agreement, we treat the remaining underlying facts found by the judge as final. See
Danger Records, supra
at 12-13. From these findings we must determine if the plaintiffs’ claims were frivolous and whether those claims, along with the business opportunity claim, were wholly insubstantial and brought in bad faith. We conclude that they were.
The judge found that the plaintiffs failed to offer any evidence in support of their allegations that the defendants overcharged MEALP for services or undervalued the 23 East Street property when they sold it. Indeed, they stipulated at trial that they had no evidence that many of the fees charged were unreasonable, and they joined a motion by the defendants to strike the testimony of the plaintiffs’ only valuation expert after it was revealed that the expert knew his calculations were incorrect. Despite this paucity of support, the plaintiffs nevertheless pressed ahead with their claims.
Given the dearth of factual or legal support and the business savvy of the plaintiffs, the judge’s findings that the plaintiffs brought frivolous, insubstantial claims in bad faith are supported by the record and consistent with our case law. See
id.
at 6-7 (§ 6F standard met when there was no evidence “other than
[the party’s] own testimony” and documents designed to “conjure up” false evidence);
Hahn
v.
Planning Bd. of Stoughton,
403 Mass. 332, 337 (1988), quoting Fed. R. Civ. P. 11 (standard met where party’s theories were “irrelevant” to case and lacked “weight or importance,” and where party had desire to “harass” or cause “needless increase in the cost of litigation”);
Lewis
v.
Emerson,
391 Mass. 517, 526 (1984) (standard met when party raised “defense without even a colorable basis in law [that] represented a significant part of [party’s] defense”);
Pollack
v.
Kelly,
372 Mass. 469, 477 & n.5 (1977) (standard can be met after party’s “continued use of . . . delaying tactics in the face of settled law”);
Pirie
v.
First Congregational Church,
43 Mass. App. Ct. 908, 910-911 (1997) (standard met when plaintiff’s claim “relied on a stipulation whose existence was terminated” and where plaintiff stated he would force defendant to litigate);
Katz
v.
Savitsky,
10 Mass. App. Ct. 792, 797 (1980) (standard met when it was “clear from the papers that when the action was brought, neither the plaintiff nor his counsel had had any reason to believe” in validity of claims).
In particular, the “[a]bsence of good faith of a claimant in litigation may be inferred reasonably from circumstances . . . .”
Massachusetts Adventura Travel, Inc.
v.
Mason,
27 Mass. App. Ct. 293, 299 (1989). See
Hahn
v.
Planning Bd. of Stoughton, supra.
Here, the inference of bad faith — that the plaintiffs had no reason to believe in the merits of their claims — is fully supported if not inescapable. Claims that are so unmoored from law or fact are the very definition of “frivolous”: “Lacking a legal basis or legal merit; not serious; not reasonably purposeful.” Black’s Law Dictionary 739 (9th ed. 2009).
d.
Award.
General Laws c. 231, § 6F, requires an award of reasonable fees and cost if all or substantially all of a party’s claims are found to be “wholly insubstantial, frivolous and not advanced in good faith.” Ordinarily, prevailing litigants are not entitled to fees because the prospect of paying an opponent’s costs “might unjustly deter those of limited resources from prosecuting or defending suits.”
Police Comm’r of Boston
v.
Gows,
429 Mass. 14, 17 (1999). Section 6F marks an exception to this rule because there is no public policy against deterring frivolous suits such as these. Where, as here, parties lack the legal or
factual basis to commence or sustain an action, yet press ahead for reasons related only to obstinance or avarice, the prospect of reimbursing their harassed opponents should cause them to rethink their litigious venture.
Having confirmed that the plaintiffs’ claims were entirely insubstantial, frivolous, and brought in bad faith, an award is mandated. Because neither party has challenged the well-reasoned calculations by the judge, we reinstate them.
3.
G. L. c. 211A, § 15, and Mass. R. A. P. 25.
The Appeals Court denied the defendants’ motion for appellate fees and costs under G. L. c. 211 A, § 15, and rule 25. It did so in part because it agreed with the decision of the single justice that the plaintiffs’ business opportunity claim was not frivolous. We have determined that decision to be incorrect as a matter of law. However, an award of appellate fees is not required by § 15 or rule 25 in the same way it is required by § 6F. See
Masterpiece Kitchen & Bath, Inc.
v.
Gordon,
425 Mass. 325, 329-330 (1997);
Avery
v.
Steele,
414 Mass. 450, 455 (1993). Consequently, the conclusion that the plaintiffs’ claims were frivolous merely triggers the discretion of the Appeals Court, and accordingly, we remand its order for further consideration.
4.
Conclusion.
The order of the single justice is reversed and the order of the judge awarding fees and costs is reinstated. The case is remanded to the Appeals Court for further consideration of its order pursuant to G. L. c. 211A, § 15, and Mass. R. A. P. 25.
So ordered.