Apisteo describes not accepting a report, message, or claim as believed.

The attested use consistently concerns not believing: people reject or fail to accept testimony, declarations, or what has been said, and the term also names those characterized by such non-belief in contrasts with believing.

1. Not accepting testimony or a stated claim · dominant

   In Acts 28:24, the form stands opposite some being persuaded by what was said; in Luke 24:11, the declarations are treated as nonsense and not believed. Mark 16:11 presents the response to hearing that he lives and had been seen, while Luke 24:41 places the present participle in a scene where they still disbelieve even as they marvel. Mark 16:16 and Romans 3:3 extend the same contrast into statements about the one who does not believe and about some who have disbelieved.

   Acts 28:24Luke 24:11Luke 24:41Mark 16:11Mark 16:16Romans 3:3

In the Anselm Project Bible: The APB commonly presents the relevant clauses with “disbelieved,” while Luke 24:11 has “did not believe” and 2 Timothy 2:13 has “faithless.” These are presentations of the clauses rather than fixed English equivalents for the term.