Quick Definition
folly, madness
Strong's Definition
stupidity; by implication, rage
Derivation: from a compound of G1 (Α) (as a negative particle) and G3563 (νοῦς);
KJV Usage: folly, madness
Thayer's Greek Lexicon
ἄνοια, ἀνοίας, ἡ (ἄνους (i. e. Ανως without understanding)), want of understanding, folly: 2Ti_3:9. madness expressing itself in rage, Luk_6:11 (δύο δ' ἀνοίας γένη, τό μέν μανίαν, τό δέ ἀμαθιαν, Plato, Tim., p. 86 b.). ((Theognis, 453); Herodotus 6, 69; Attic writings from Thucydides down.)
Mounce Concise Greek Dictionary
ἄνοια anoia 2x
want of understanding; folly, rashness, madness, Luk_6:11 ; 2Ti_3:9
Abbott-Smith Greek Lexicon
ἀνοια , -ας , ἡ
( < ἄ -νοος , without understanding ),
[in LXX : Pr 14:8, 2215 ( H200 ), Wis_15:18 , al. ;]
folly, foolishness: 2Ti_3:9 ; expressed in violent rage ( cf. Plat ., Tim., 86B): Luk_6:11 .†
Liddell-Scott — Intermediate Greek Lexicon
ἄνοια [Etym: ἄνοος] "want of understanding, folly", Hdt. , etc.; ὑπ᾽ ἀνοίας Aesch. ; πολλὴ ἄνοιά [ἐστι] πολεμῆσαι Thuc.
STEPBible — Tyndale Abridged Greek Lexicon
ἀνοια, -ας, ἡ
(ἄ-νοος, without understanding), [in LXX: Pro.14:8, 2215 (אִוֶּלֶת), Wis.15:18, al. ;]
folly, foolishness: 2Ti.3:9; expressed in violent rage (cf. Plat., Tim., 86B): Luk.6:11.†
(AS)