Abbott-Smith Manual Greek Lexicon
ἀπιστέω (G569)
8 ** ἀπιστέω , -ῶ ( ἄπιστος ), [in LXX: Wi 1:2 10:7 12:17 18:13 , Si 1:27 , II Mac 8:13 *;] to disbelieve , be faithless : Mk 16:11 , 16 , Lk 24:11 , 41 , Ac 28:24 , I Pe 2:7 ; so prob. also Ro 3:3 , II Ti 2:13 ( ICC , CGT , in ll.; MM, s.v.). = ἀπειθέω (Hdt.; on this sense in Ro 3:3 , II Ti 2:13 , v. Vaughan on Ro 3:3 ; Lft., Notes , 265; Thayer, s.v.).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain