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Adjective: dumfounding  'dúm,fawn-ding or dúm'fawn-ding [N. Amer], dúm'fawn-ding [Brit]
  1. Bewildering or striking dumb with wonder
    - astounding, dumbfounding
Verb: dumfound  dúm,fawnd or dúm'fawnd [N. Amer], dúm'fawnd [Brit]
  1. To strike dumb; to confuse with astonishment
    "His plan was to defend and maintain them as to cramp and dumfound his opponents"

See also: incredible, unbelievable