dumbstruck

The definition of dumbstruck is someone who is speechless from shock.

(adjective)

An example of dumbstruck is a man being unable to speak after his girlfriend tells him she's pregnant.

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See dumbstruck in Webster's New World College Dictionary

adjective

so shocked as to be speechless

See dumbstruck in American Heritage Dictionary 4

adjective
So shocked or astonished as to be rendered speechless.

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