Lexical Definition

‎ἄνοια‎ ánoia (an'-oy-ah) folly G:N-F
from a compound of ‎Α‎ (as a negative particle) and ‎νοῦς‎

folly, madness.

Usage: 4 forms in 6 verses
Form Translated As     In Verse(s)
ἄνοια the folly 2Tim.3.9
ἀνοίασ with rage Luke.6.11
άνοιαν thoughtlessness LXX.Ps.22.2
άνοια Thoughtlessness LXX.Prov.22.15LXX.Eccl.11.10
but the thoughtlessness LXX.Prov.14.8

Abbott-Smith

ἄνοια, -ας, ἡ (< ἄ-νοος, without understanding), [in LXX: Pr 14:8 22:15 (אִוֶּלֶת), Wi 15:18, al.;]
folly, foolishness: II Ti 3:9; expressed in violent rage (cf. Plat., Tim., 86B): Lk 6:11.†

Abbott-Smith References

Book Refs
Proverbs 14:8 · 22:15
Luke 6:11
2 Timothy 3:9

Liddell-Scott-Jones

ἄνοια,

Epic dialect ἀνοίη [Refs 6th c.BC+], :— the character of an ἄνοος, want of understanding, folly, ἀνοίη in folly, [Refs 5th c.BC+]; πολλῆ ἀνοια χρῆσθαι to be a great fool, [Refs 5th c.BC+]; ἄνοιαν ὀφλισκάνειν to be thought a fool, [Refs 5th c.BC+]; but opposed to μανία, [Refs]: plural, follies, [Refs 5th c.BC+]