Incredible

From BiblePortal Wikipedia

Vine's Expository Dictionary of NT Words [1]

1: Ἄπιστος (Strong'S #571 — Adjective — apistos — ap'-is-tos )

is once rendered "incredible,"  Acts 26:8 , of the doctrine of resurrection; elsewhere it is used of persons, with the meaning "unbelieving." See Belief , C, Note (3).

King James Dictionary [2]

INCRED'IBLE, a. L. incredibilis in and credibilis, credible.

That cannot be believed not to be credited too extraordinary and improbable to admit of belief.

Why should it be thought a thing incredible with you, that God should raise the dead?  Acts 26

Webster's Dictionary [3]

(a.) Not credible; surpassing belief; too extraordinary and improbable to admit of belief; unlikely; marvelous; fabulous.

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