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.
disbelief 0543 - apeitheia {ap-i'-thi-ah}; from 0545; {disbelief} (obstinate and rebellious): -- disobedience, unbelief.
disbelief 0570 - apaistia {ap-is-tee'-ah}; from 0571; faithlessness, i.e. (negatively) {disbelief} (lack of Christian faith), or (positively) unfaithfulness (disobedience): -- unbelief.
unbelief 0543 - apeitheia {ap-i'-thi-ah}; from 0545; disbelief (obstinate and rebellious): -- disobedience, {unbelief}.
unbelief 0570 - apaistia {ap-is-tee'-ah}; from 0571; faithlessness, i.e. (negatively) disbelief (lack of Christian faith), or (positively) unfaithfulness (disobedience): -- {unbelief}.