variants:
or less commonly dumfound
dumbfounded also dumfounded; dumbfounding also dumfounding; dumbfounds also dumfounds
Definition of dumbfound
: to confound (see confound sense 1) briefly and usually with astonishment
were dumbfounded at what they saw
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Merriam-Webster unabridged
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Time Traveler for dumbfound
The first known use of dumbfound was in 1653
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