Quick Definition
παραφρονία, ας, ἡ n.f. madness, folly
Strong's Definition
from 3912; insanity, i.e. foolhardiness
KJV Usage: madness
UBS Dictionary of the Greek New Testament
noun, f. | -ας | φρονέω
30.24 · Think · To Think, Thought
to not be in one’s right mind, to be insane, to be mad, to be out of one’s mind, insanity, madness to think or reason in a completely irrational manner It may be necessary in some languages to restructure the expression ‘stopped the prophet’s insane action.’ This can often be done by saying ‘prevented the prophet from acting like a crazy person.’ In other languages παραφρονία is best rendered by an idiomatic expression such as ‘wandering thoughts’ or ‘twisted thoughts.’
1 It is possible that there are some significant differences in meaning between the set μαίνομαι / μανία and the set παραφρονέω / παραφρονία, but the difference is likely to be more connotative than denotative, as, for example, the distinction in English between crazy and insane.
UBS Dictionary of the Greek New Testament © United Bible Societies, licensed CC BY-SA 4.0.
Thayer's Greek Lexicon
παρα-φρονία, -as, 7, (παράφρων [see the preceding word]), madness, insanity: 2 Pet. ii. 16. The Grk. writ. use not this word but παραφροσύνη [cf. W. 24; 95 (90)].
Mounce Concise Greek Dictionary
παραφρονία paraphronia 1x
madness, folly, 2 Pet. 2:16*
Abbott-Smith Greek Lexicon
*† παρα-φρονία, -ας, ἡ, = cl. παραφροσύνη, madness: II Pe 2:16.†
Moulton & Milligan — Vocabulary of the Greek NT
παραφρονία. We can cite no instance of this form as in 2 Pet 215 (v./, παραφροσύνη), but for παραφρόνησις (as in LXX Zach 124) cf. BGU I. 3107! (Byz.) π[α]ραφρονήσεως.
Liddell-Scott-Jones — Greek-English Lexicon
παραφρονία (paraphronia) — insanity. παραφρον-έω, to be beside oneself, deranged, [Refs 5th c.BC+]: poetry παραιφρ- [Refs 3rd c.BC+]
2. to be delirious, variant in [Refs 5th c.BC+]. παραφρόν-ησις, εως, ἡ, ={παραφροσύνη}, [LXX+5th c.BC+] middle in [Refs]