Apistia is the condition of failing to believe, shown as resistance, wavering, or a barrier to receiving what is promised.

The occurrences consistently portray a failure to believe: it is associated with hardness of heart, wavering concerning God’s promise, remaining in a condition from which restoration is possible, and inability to enter. The same term can also be named by a speaker seeking help in the midst of belief.

1. Failure or refusal to believe · dominant

   Across accusative ἀπιστίαν and dative ἀπιστίᾳ forms, the term marks the condition behind concrete outcomes: in Mark 16:14 the APB renders Jesus’ rebuke of the eleven’s "unbelief and hardness of heart," while in Matthew 13:58 it renders the reason many powers were not performed there. In Hebrews 3:19 it is given as the reason they were unable to enter; Romans 11:20 and Romans 11:23 place it in contrast with standing by faith and no longer continuing in that condition. Mark 9:24 presents it within the father’s cry for help alongside his stated belief.

   Mark 16:14Matthew 13:58Hebrews 3:19Romans 11:20Romans 11:23Mark 9:24

In the Anselm Project Bible: The APB repeatedly presents the term with “unbelief,” including causal phrases such as “because of unbelief” and a personal plea, “help my unbelief.” These renderings confirm the clauses’ overall presentation rather than establishing a separate English equivalent in every instance.