belief 4102 # pistis {pis'-tis}; from 3982; persuasion, i.e. 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.
disobedience 0543 # apeitheia {ap-i'-thi-ah}; from 545; disbelief (obstinate and rebellious): -- {disobedience}, unbelief.
unbelief 0543 # apeitheia {ap-i'-thi-ah}; from 545; disbelief (obstinate and rebellious): -- disobedience, {unbelief}.
unbelief 0570 # apaistia {ap-is-tee'-ah}; from 571; faithlessness, i.e. (negatively) disbelief (lack of Christian faith), or (positively) unfaithfulness (disobedience): -- {unbelief}.