English

Adjective

increditable ‎(comparative more increditable, superlative most increditable)

1. (rare) Incapable of being believed; not creditable.
   • 1860 July 11, "The President, Mr. Vanderbilt, and the Pacific Mails" (editorial), New York Times (retrieved 26 Nov 2011):

     Increditable as it may seem, we suspect the Constitution of irony.

   • 1887, Robert Louis Stevenson, Memories and Portraits, ch. 13:

     [T]he shopmen . . . , increditable as it may sound, used to demand of us upon our entrance, like banditti, if we came with money or with empty hand.

Synonyms

• incredible, unbelievable