Dictionary entry

Incredible

Webster's Dictionary 1913

In‐cred″i‐ble (?), a. [L. incredibilis: cf. OF. incredible. See In- not, and Credible.] Not credible; surpassing belief; too extraordinary and improbable to admit of belief; unlikely; marvelous; fabulous.

Why should it be thought a thing incredible with you, that God should raise the dead? Acts xxvi. 8.