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So shocked or astonished as to be rendered speechless.
temporarily deprived of speech through shock or surprise
also dumb•strick•en(-ˌstrɪk ən)
temporarily deprived of the power of speech, as by surprise or confusion; dumbfounded.
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|Adj.||1.||dumbstruck - 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"|
surprised - taken unawares or suddenly and feeling wonder or astonishment; "surprised by her student's ingenuity"; "surprised that he remembered my name"; "a surprised expression"