'Incredibleness' definitions:

Definition of 'incredibleness'

From: WordNet
noun
The quality of being incredible [syn: incredibility, incredibleness] [ant: believability, credibility, credibleness]

Definition of 'Incredibleness'

From: GCIDE
  • Incredibleness \In*cred"i*ble*ness\, n. Incredibility. [1913 Webster]