Peters, C. J.
The sole issue in this appeal is whether the aggravating factor “especially cruel,” contained in this state’s death penalty statute, General Statutes § 53a-46a (h) (4), is unconstitutionally vague. The trial court granted the defendant’s motion to dismiss the state’s alleged aggravating factor and we then granted the state’s motion for an expedited appeal pursuant to General Statutes § 52-265a. We remand the case to the trial court with direction to proceed with the capital sentencing hearing.
By substitute information the state charged the defendant with two counts of murder, pursuant to General Statutes § 53a-54a (a), and one count of capital felony, pursuant to General Statutes § 53a-54b (8).1 Before trial and in response to the defendant’s motion for written notice of any aggravating factors, the state alleged that the defendant had committed the offense “in an especially cruel manner,”2 and therefore should [260]*260be sentenced to death if convicted of the predicate capital felony. The defendant moved the trial court to dismiss the aggravating factor, claiming that its vagueness violated our federal and state constitutions.
The trial court granted the defendant’s motion to dismiss, holding that the term “especially cruel” was facially vague and overbroad in violation of the federal constitution. U.S. Const., amends. VIII and XTV. While the trial proceeded on the murder and capital felony charges, the state sought and received permission to file an expedited appeal to this court. General Statutes § 52-265a. Thereafter a jury returned guilty verdicts on all three counts of the information.
On appeal, the state urges us to remand the case to the trial court for further proceedings leading to the defendant’s sentencing. The state suggests one of two possible courses of action: (1) to order the trial court to devise an appropriate limiting construction of the term “especially cruel”; or (2) to adopt a limiting construction ourselves to guide the trial court. The defendant, on the other hand, argues that the trial court correctly dismissed the aggravating factor because the legislature, which defines criminal conduct in this state, should by statute undertake the task of limiting the definition of the term “especially cruel” to meet constitutional standards.
Our death penalty statute, General Statutes § 53a-46a,3 permits a person convicted of a capital [261]*261felony to be sentenced to death if the state proves the existence of an aggravating factor beyond a reasonable doubt and the defendant fails to prove the existence of a mitigating factor by a preponderance [262]*262of the evidence. General Statutes § 53a-46a (g) and (h); State v. Daniels, 207 Conn. 374, 384-85, 542 A.2d 306 (1988) {Daniels I). Because “the death penalty is exacted with great infrequency even for the most [263]*263atrocious crimes [there must be a] meaningful basis for distinguishing the few cases in which it is imposed from the many cases in which it is not.” Furman v. Georgia, 408 U.S. 238, 313, 92 S. Ct. 2726, 33 L. Ed. 2d 346, reh. denied sub nom. Jackson v. Georgia, 409 U.S. 902, 93 S. Ct. 89, 34 L. Ed. 2d 164 (1972) (White, J., concurring).4 Our statute reflects the effort of our legislature to distinguish the most culpable of homicides from all other homicides.
The United States Supreme Court has held that “if a State wishes to authorize capital punishment it has a constitutional responsibility to tailor and apply its law in a manner that avoids the arbitrary and capricious infliction of the death penalty. Part of a State’s responsibility in this regard is to define the crimes for which death may be the sentence in a way that obviates ‘stan-dardless [sentencing] discretion.’ ” Godfrey v. Georgia, 446 U.S. 420, 428, 100 S. Ct. 1759, 64 L. Ed. 2d 398 (1980). Thus, “where discretion is afforded a sentencing body on a matter so grave as the determination of whether a human life should be taken or spared, that discretion must be suitably directed and limited so as to minimize the risk of wholly arbitrary and capricious [264]*264action.” Gregg v. Georgia, 428 U.S. 153, 189, 96 S. Ct. 2909, 49 L. Ed. 2d 859 (1976) (opinion of Stewart, Powell and Stevens, Js.). Of special importance to this case, a state must avoid defining aggravating factors in an open-ended, subjective manner that would allow the trier unfettered discretion in levying a death sentence and thus create a substantial risk that the trier will inflict punishment arbitrarily or capriciously. California v. Brown, 479 U.S. 538, 541, 107 S. Ct. 837, 93 L. Ed. 2d 934 (1987).5 A capital sentencing “system could have standards so vague that they would fail adequately to channel the sentencing decision patterns of [triers] with the result that a pattern of arbitrary and capricious sentencing . . . could occur.” Gregg v. Georgia, supra, 195 n.46.6 Therefore, “an aggravating circumstance must genuinely narrow the class of persons eligible for the death penalty and must reason[265]*265ably justify the imposition of a more severe sentence on the defendant compared to others found guilty of murder.” Zant v. Stephens, 462 U.S. 862, 877, 103 S. Ct. 2733, 77 L. Ed. 2d 235 (1983).
Most of the aggravating factors contained in Connecticut’s death penalty statute direct the trier to make a definite, objective finding. See General Statutes § 53a-46a (h) (1), (2), (5) and (6). Section 53a-46a (h) (4), however, contains an arguably subjective standard, that “the defendant committed the offense in an especially . . . cruel . . . manner.” Two United States Supreme Court decisions are particularly instructive on the constitutional validity of this criterion as a basis for imposition of the death penalty.
In Godfrey v. Georgia, supra, a jury convicted the petitioner of two counts of murder and one count of aggravated assault. At the sentencing hearing, the trial court charged the jury that it could impose a death sentence if it found beyond a reasonable doubt that the offense was “outrageously or wantonly vile, horrible and inhuman,” the aggravating factor promulgated by the Georgia legislature. The United States Supreme Court held this factor unconstitutionally vague under Gregg v. Georgia, supra, explaining that the jury had sentenced the petitioner to death “based upon no more than a finding that the offense was ‘outrageously or wantonly vile, horrible and inhuman.’ There is nothing in these few words, standing alone, that implies any inherent restraint on the arbitrary and capricious infliction of the death sentence. A person of ordinary sensibility could fairly characterize almost every murder as ‘outrageously or wantonly vile, horrible and inhuman.’ ” Godfrey v. Georgia, supra, 428-29.7
[266]*266In Maynard v. Cartwright,
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Peters, C. J.
The sole issue in this appeal is whether the aggravating factor “especially cruel,” contained in this state’s death penalty statute, General Statutes § 53a-46a (h) (4), is unconstitutionally vague. The trial court granted the defendant’s motion to dismiss the state’s alleged aggravating factor and we then granted the state’s motion for an expedited appeal pursuant to General Statutes § 52-265a. We remand the case to the trial court with direction to proceed with the capital sentencing hearing.
By substitute information the state charged the defendant with two counts of murder, pursuant to General Statutes § 53a-54a (a), and one count of capital felony, pursuant to General Statutes § 53a-54b (8).1 Before trial and in response to the defendant’s motion for written notice of any aggravating factors, the state alleged that the defendant had committed the offense “in an especially cruel manner,”2 and therefore should [260]*260be sentenced to death if convicted of the predicate capital felony. The defendant moved the trial court to dismiss the aggravating factor, claiming that its vagueness violated our federal and state constitutions.
The trial court granted the defendant’s motion to dismiss, holding that the term “especially cruel” was facially vague and overbroad in violation of the federal constitution. U.S. Const., amends. VIII and XTV. While the trial proceeded on the murder and capital felony charges, the state sought and received permission to file an expedited appeal to this court. General Statutes § 52-265a. Thereafter a jury returned guilty verdicts on all three counts of the information.
On appeal, the state urges us to remand the case to the trial court for further proceedings leading to the defendant’s sentencing. The state suggests one of two possible courses of action: (1) to order the trial court to devise an appropriate limiting construction of the term “especially cruel”; or (2) to adopt a limiting construction ourselves to guide the trial court. The defendant, on the other hand, argues that the trial court correctly dismissed the aggravating factor because the legislature, which defines criminal conduct in this state, should by statute undertake the task of limiting the definition of the term “especially cruel” to meet constitutional standards.
Our death penalty statute, General Statutes § 53a-46a,3 permits a person convicted of a capital [261]*261felony to be sentenced to death if the state proves the existence of an aggravating factor beyond a reasonable doubt and the defendant fails to prove the existence of a mitigating factor by a preponderance [262]*262of the evidence. General Statutes § 53a-46a (g) and (h); State v. Daniels, 207 Conn. 374, 384-85, 542 A.2d 306 (1988) {Daniels I). Because “the death penalty is exacted with great infrequency even for the most [263]*263atrocious crimes [there must be a] meaningful basis for distinguishing the few cases in which it is imposed from the many cases in which it is not.” Furman v. Georgia, 408 U.S. 238, 313, 92 S. Ct. 2726, 33 L. Ed. 2d 346, reh. denied sub nom. Jackson v. Georgia, 409 U.S. 902, 93 S. Ct. 89, 34 L. Ed. 2d 164 (1972) (White, J., concurring).4 Our statute reflects the effort of our legislature to distinguish the most culpable of homicides from all other homicides.
The United States Supreme Court has held that “if a State wishes to authorize capital punishment it has a constitutional responsibility to tailor and apply its law in a manner that avoids the arbitrary and capricious infliction of the death penalty. Part of a State’s responsibility in this regard is to define the crimes for which death may be the sentence in a way that obviates ‘stan-dardless [sentencing] discretion.’ ” Godfrey v. Georgia, 446 U.S. 420, 428, 100 S. Ct. 1759, 64 L. Ed. 2d 398 (1980). Thus, “where discretion is afforded a sentencing body on a matter so grave as the determination of whether a human life should be taken or spared, that discretion must be suitably directed and limited so as to minimize the risk of wholly arbitrary and capricious [264]*264action.” Gregg v. Georgia, 428 U.S. 153, 189, 96 S. Ct. 2909, 49 L. Ed. 2d 859 (1976) (opinion of Stewart, Powell and Stevens, Js.). Of special importance to this case, a state must avoid defining aggravating factors in an open-ended, subjective manner that would allow the trier unfettered discretion in levying a death sentence and thus create a substantial risk that the trier will inflict punishment arbitrarily or capriciously. California v. Brown, 479 U.S. 538, 541, 107 S. Ct. 837, 93 L. Ed. 2d 934 (1987).5 A capital sentencing “system could have standards so vague that they would fail adequately to channel the sentencing decision patterns of [triers] with the result that a pattern of arbitrary and capricious sentencing . . . could occur.” Gregg v. Georgia, supra, 195 n.46.6 Therefore, “an aggravating circumstance must genuinely narrow the class of persons eligible for the death penalty and must reason[265]*265ably justify the imposition of a more severe sentence on the defendant compared to others found guilty of murder.” Zant v. Stephens, 462 U.S. 862, 877, 103 S. Ct. 2733, 77 L. Ed. 2d 235 (1983).
Most of the aggravating factors contained in Connecticut’s death penalty statute direct the trier to make a definite, objective finding. See General Statutes § 53a-46a (h) (1), (2), (5) and (6). Section 53a-46a (h) (4), however, contains an arguably subjective standard, that “the defendant committed the offense in an especially . . . cruel . . . manner.” Two United States Supreme Court decisions are particularly instructive on the constitutional validity of this criterion as a basis for imposition of the death penalty.
In Godfrey v. Georgia, supra, a jury convicted the petitioner of two counts of murder and one count of aggravated assault. At the sentencing hearing, the trial court charged the jury that it could impose a death sentence if it found beyond a reasonable doubt that the offense was “outrageously or wantonly vile, horrible and inhuman,” the aggravating factor promulgated by the Georgia legislature. The United States Supreme Court held this factor unconstitutionally vague under Gregg v. Georgia, supra, explaining that the jury had sentenced the petitioner to death “based upon no more than a finding that the offense was ‘outrageously or wantonly vile, horrible and inhuman.’ There is nothing in these few words, standing alone, that implies any inherent restraint on the arbitrary and capricious infliction of the death sentence. A person of ordinary sensibility could fairly characterize almost every murder as ‘outrageously or wantonly vile, horrible and inhuman.’ ” Godfrey v. Georgia, supra, 428-29.7
[266]*266In Maynard v. Cartwright, 486 U.S. 356, 108 S. Ct. 1853, 100 L. Ed. 2d 372 (1988), an Oklahoma jury sentenced the petitioner to death based in part upon a finding that he had committed murder in an “especially heinous, atrocious, or cruel” manner. The trial court had not limited, in any fashion, the jury’s construction of this aggravating factor. A unanimous court relied on Godfrey to hold that “the language of the Oklahoma aggravating circumstance at issue . . . gave no more guidance than the ‘outrageously or wantonly vile, horrible or inhuman’ language that the-jury returned in its verdict in Godfrey” Id., 363-64. The court therefore struck the aggravating factor as facially vague and remanded the case to allow the Oklahoma court the opportunity to define the statutory aggravating factor with sufficient precision to satisfy constitutional standards.8
As we have recently noted, Godfrey and Maynard raise serious questions about the constitutional validity of § 53a-46a (h) (4). See State v. Daniels, 209 Conn. 225, 228-29 n.1, 550 A.2d 885 (1988) (Daniels II). On its face, there is no apparent distinction between our statutory reference to the commission of the offense “in an especially . . . cruel . . . manner” and the Oklahoma statute that Maynard struck down. Indeed, the trial court in this case granted the defendant’s motion to dismiss the aggravating factor precisely on this ground. The state does not take issue with the trial court’s ruling insofar as it concluded that, without more, the “especially cruel” aggravating factor cannot withstand a vagueness challenge. We agree.
Godfrey and Maynard, however, contain an important caveat. In each case, the United States Supreme Court alluded to an absence of jury instructions that [267]*267might have limited the ambit of a statutory term that was otherwise unconstitutionally vague.9 More pointedly, the court in Maynard stated that it did “not hold that some kind of torture or serious physical abuse is the only limiting construction of the heinous, atrocious, or cruel aggravating circumstance that would be constitutionally acceptable.” Maynard v. Cartwright, supra, 365. By implication, certain limiting constructions of the aggravating circumstance would correct the constitutional infirmity.
This observation in Maynard is entirely consistent with the United States Supreme Court’s earlier decision in Proffitt v. Florida, 428 U.S. 242, 96 S. Ct. 2960, 49 L. Ed. 2d 913, reh. denied, 429 U.S. 875, 97 S. Ct. 197, 50 L. Ed. 2d 158 (1976). In Proffitt the petitioner attacked on vagueness grounds the state’s enumerated aggravating factor: “[The capital felony was] ‘especially heinous, atrocious, or cruel.’ ” The court held that “[t]hese provisions must be considered as they have been construed by the Supreme Court of Florida.” Id., 255. The Florida Supreme Court had held that the “provision [was] directed only at ‘the conscienceless or pitiless crime which is unnecessarily torturous to the victim.’ ” Id., quoting (State v. Dixon, 283 So. 2d 1, 9 (Fla. 1973). Thus, the United States Supreme Court concluded that it could not “say that the provision, as [268]*268so construed, provides inadequate guidance to those charged with the duty of recommending or imposing sentences in capital cases.” Proffitt v. Florida, supra, 256; see also Gregg v. Georgia, supra, 201 (arguably any murder involves depravity of mind, but “there is no reason to assume that the Supreme Court of Georgia will adopt such an open-ended construction”).
Thus, it is apparent that the term “especially cruel,” while unconstitutionally vague standing alone, can be limited and construed so as to pass constitutional muster.10 The dispositive question therefore becomes who should undertake to provide a limiting construction of “in an especially cruel manner.” The defendant argues that neither this court nor the trial court should engage in any further definition of the term because that task falls within the legislature’s domain. The state maintains that we have an independent responsibility for statutory construction that it is our duty to exercise. We agree with the state.
The defendant is correct in his assertion that the power to define crimes and to designate the penalties therefor resides in the legislature. State v. Ellis, 197 Conn. 436, 455-56, 497 A.2d 974 (1985). Courts must avoid imposing criminal liability where the legislature [269]*269has not expressly so intended. State v. Grullon, 212 Conn. 195, 200, 562 A.2d 481 (1989); State v. Hufford, 205 Conn. 386, 392, 533 A.2d 866 (1987). Thus, we construe penal statutes strictly in favor of the accused. State v. Whiteman, 204 Conn. 98, 101, 526 A.2d 869 (1987); State v. Edwards, 201 Conn. 125, 132, 513 A.2d 669 (1986). This construction is all the more compelling where, as here, the defendant’s life is at stake. State v. McGann, 199 Conn. 163, 177, 506 A.2d 109 (1986).
The party attacking a validly enacted statute, however, bears the heavy burden of proving its unconstitutionality beyond a reasonable doubt and we indulge in every presumption in favor of the statute’s constitutionality. Motor Vehicle Manufacturers Assn. of the United States, Inc. v. O’Neill, 212 Conn. 83, 100, 561 A.2d 917 (1989); Zapata v. Burns, 207 Conn. 496, 507-508, 542 A.2d 700 (1988); State v. Hernandez, 204 Conn. 377, 385, 528 A.2d 794 (1987). In choosing between two constructions of a statute, one valid and one constitutionally precarious, we will search for an effective and constitutional construction that reasonably accords with the legislature’s underlying intent. See Motor Vehicle Manufacturers Assn. of the United States, Inc. v. O’Neill, supra, 96; McConnell v. Beverly Enterprises-Connecticut, Inc., 209 Conn. 692, 706, 553 A.2d 596 (1989); Bishop v. Kelly, 206 Conn. 608, 617, 539 A.2d 108 (1988); French v. Amalgamated Local Union 376, 203 Conn. 624, 636-37, 526 A.2d 861 (1987); see also Lublin v. Brown, 168 Conn. 212, 219-20, 362 A.2d 769 (1975). We undertake this search for a constitutionally valid construction when confronted with criminal statutes as well as with civil statutes. State v. Snook, 210 Conn. 244, 251, 555 A.2d 390 (1989); State v. Champagne, 206 Conn. 421, 437, 538 A.2d 193 (1988).
Conjoining these various canons of statutory construction, we conclude that we must, if possible, put [270]*270a judicial gloss upon the term “especially cruel” that adopts a definition that saves this term from its facial vagueness and yet construes it as narrowly as possible in the defendant’s favor. Both the state and the defendant admit to the availability of such a core construction, although the defendant counsels us against its adoption.
Both parties agree that if “especially cruel” has any meaning in the capital felony context, that meaning must include the intentional infliction of extreme pain or torture above and beyond that necessarily accompanying the underlying killing. We agree. We hereby adopt this definition of “especially cruel” as an acceptable core construction of § 53a-46a (h) (4). This construction comports with, and indeed is somewhat narrower than, the common definition of “cruel”11: “[Disposed to inflict pain . . . in a wanton, insensate, or vindictive manner . . . . ” Webster’s Third New International Dictionary.12 Further, we can infer from Proffitt, Godfrey and Maynard, that such an objective judicial gloss protects the term “especially cruel” from attack on vagueness grounds. While the parties may disagree over how broadly the term “especially cruel” may be construed, “we rewrite nothing in the language of the statute” by assigning to it a limited core construction.[271]*27113 State v. Snook, supra, 251. Our construction of “especially cruel” rests on our perception that the legislature, in enacting § 53a-46a (h) (4), meant to impose the death penalty at least in those cases in which the trier has found that the defendant intentionally inflicted extreme pain or torture upon the victim, above and beyond the pain necessarily accompanying the victim’s death.
It bears mentioning what we have not decided in this case. First, we have not decided whether the death penalty, per se or as applied, violates any provision of our state constitution. While the defendant asks us to interpret our own constitution to provide relief beyond that afforded to him by the federal constitution, we agree with the trial court that he has not advanced any concrete arguments for a separate state constitutional treatment of this issue. State v. Herring, 210 Conn. 78, 98 n.19, 554 A.2d 686 (1989); State v. Mercer, 208 Conn. 52, 67 n.9, 544 A.2d 611 (1988). Second, we have not determined what standard of review will govern any future appeal of the defendant’s conviction or death sentence, should one be imposed, except with regard to the core construction of the aggravating factor “especially cruel.” See General Statutes § 53a-46b. Finally, because we construe the term “especially cruel” as narrowly as possible in the defendant’s favor, we have not considered to what extent the legislature may constitutionally broaden the definition of the term “especially cruel.”
[272]*272There is error and the case is remanded to the trial court to proceed with the sentencing hearing in a manner consistent, with this opinion.
In this opinion Shea, Callahan, Covello, Hull and Santaniello, Js., concurred.