From apistos; faithlessness, i.e. (negatively) disbelief (lack of Christian faith), or (positively) unfaithfulness (disobedience) -- unbelief.

see GREEK apistos

ἀπιστίᾳ (apistia) − 6 Occurrences

ἀπιστίαν (apistian) − 4 Occurrences

ἀπιστίας (apistias) − 1 Occurrence