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Adjective: dumbfounded  'dúm,fawn-did or dúm'fawn-did [N. Amer], dúm'fawn-did [Brit]
  1. As if struck dumb with astonishment and surprise
    "a circle of policemen stood dumbfounded by her denial of having seen the accident";
    - dumfounded, flabbergasted, stupefied, thunderstruck, dumbstruck, dumbstricken
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: surprised

Type of: be