"stricken dumb, confused, perplexed," 1680s, past-participle adjective from dumbfound.
a circle of policemen stood dumbfounded by her denial of having seen the accident
duma
dumb
dumb-ass
dumb-bell
dumbfound
dumbfounded
dumbledore
dumbness
dumbo
dumb-show
dumbstruck
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