Dict: strongs - belief
Strongs:
G4102 @ πίστις pistis pis'-tis From G3982; persuasion that is credence; moral conviction (of religious truth or the truthfulness of God or a religious teacher) especially reliance upon Christ for salvation; abstractly constancy in such profession; by extension the system of religious (Gospel) truth itself: - assurance belief believe faith fidelity.
G543 @ ἀπείθεια apeitheia ap-i'-thi-ah From G545; disbelief (obstinate and rebellious): - disobedience unbelief.
G570 @ ἀπιστία apistia ap-is-tee'-ah From G571; faithlessness that is (negatively) disbelief (want of Christian faith) or (positively) unfaithfulness (disobedience): - unbelief.