Word: apistia

Pronounce: ap-is-tee'-ah

Strongs Number: G570

Orig: from 571; faithlessness, i.e. (negatively) disbelief (lack of Christian faith), or (positively) unfaithfulness (disobedience):--unbelief. G571

Use: TDNT-6:174,849 Noun Feminine

Heb Strong:

1) unfaithfulness, faithless
2) want of faith, unbelief
3) weakness of faith