incredible

uskomaton Too implausible to be credible; beyond belief; unbelievable. (defdate)
1980 September 16, (w), quoted in William A. Schwartz et al., The Nuclear Seduction: Why the Arms Race Doesn’t Matter—And What Does, University of California Press (1990, 1993), ISBN 0-520-06134-9, http://books.google.com/books?id=A2Rtffsvc8wC&pg=PA29&&dq=incredible page 29:

I get lost in what is credible and not credible. This whole thing gets so incredible when you consider wiping out whole nations, it is difficult to establish credibility.

He therefore found revealed religion incredible in a literal sense, and, as Bayle had done before him, he radically separated morality from the practice of organized religion.

He was so wrapped up in watching the incredible special effects that he couldnt keep track of the story.''

I had such an incredible slice of pizza last night that I simply cant think about anything else.''