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Adjective: dumbfounding  'dúm,fawn-ding or dúm'fawn-ding [N. Amer], dúm'fawn-ding [Brit]
  1. Bewildering or striking dumb with wonder
    "These sciences revealed not only the dumbfounding largeness of the universe but also the dumbfounding smallness of human beings";
    - astounding, dumfounding
Verb: dumbfound  'dúm,fawnd or dúm'fawnd [N. Amer], dúm'fawnd [Brit]
  1. Be confusing or perplexing to; cause to be unable to think clearly
    "These questions dumbfound even the experts";
    - confuse, throw, fox, befuddle, fuddle, bedevil, confound, discombobulate, perplex, vex, stick, get, puzzle, mystify, baffle, beat, pose, bewilder, flummox, stupefy, nonplus, gravel

See also: incredible, unbelievable

Type of: be