ἀπιστία

ἀπιστία — apistía

ἀπιστία, ἀπιστίας, ἡ (from ἄπιστος), want of faith and trust;

1. unfaithfulness, faithlessness (of persons betraying a trust): Rom 3:3 (cf. references under the word ἀπιστέω, 1).

2. want of faith, unbelief: shown in withholding belief in the divine power, Mar 16:14, or in the power and promises of God, Rom 4:20; Heb 3:19; in the divine mission of Jesus, Mat 13:58; Mar 6:6; by opposition to the gospel, 1Ti 1:13; with the added notion of obstinacy, Rom 11:20; Rom 11:23; Heb 3:12. contextually, weakness of faith: Mat 17:20 (where L T Tr WH ὀλιγοπιστίαν); Mar 9:24. (In Greek writings from Hesiod and Herodotus down.)