definition of
dumbfounded

[1] #1 dumbfounded s. [dumfounded, flabbergasted, stupefied, thunderstruck, dumbstruck, dumbstricken] as if struck dumb with astonishment and surprise; "a circle of policement stood dumbfounded by her denial of having seen the accident"; "the flabbergasted aldermen were speechless"; "was thunderstruck by the news of his promotion". wn