Skip to definition.
Get the FREE one-click dictionary software for Windows or the iPhone/iPad and Android apps

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