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Adjective: dumfounded  '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 dumfounded by her denial of having seen the accident";
    - dumbfounded, flabbergasted, stupefied, thunderstruck, dumbstruck, dumbstricken

See also: surprised