unbelief

refusal to accept something as true a natural-born skeptic, she typically greets the latest conspiracy theory with head-shaking unbelief Synonyms incredulity, nonbelief, disbeliefRelated Words discredit, distrust, doubt, mistrust, skepticism, suspicion, uncertainty; denial, rejection, repudiation, unfaithNear Antonyms acceptance, conviction, faith; trustAntonyms belief, credence, credit