Lexical Definition

‎ἀπείθεια‎ apeítheia (ap-i'-thi-ah) disobedience ^G:N-F
from ‎ἀπειθής‎

disobedience, unbelief.

• disbelief (obstinate and rebellious)

Abbott-Smith

** ἀπείθεια (WH, -θία, exc. He 4:6, 11), -ας, ἡ (< ἀπειθής), [in LXX IV Mac 8:9, 18 12:4*;]
disobedience (MM, VGT, s.v.): Ro 11:30, 32, He 4:6, 11; υἱοὶ τῆς ἀ. (gen. of definition, v. M, Pr., 73 f.), Eph 2:2 5:6, Col 3:6 (T, WH, R, mg., omit).†

Abbott-Smith References

Liddell-Scott-Jones

ἀπείθεια-εια, ἡ,

disobedience, [NT+5th c.BC+]; later ἀπειθία, ἡ, [Refs 2nd c.AD+]

_{LSJ Scripture Refs: Eph.5.7}