adjective
unable to speak because of strong emotion; speechless
adverb
in a state of being speechless or unable to act due to shock or amazement
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Upon hearing the news, she was dumbstruck and unable to speak.
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I was totally dumbstruck when I found out I won the lottery!
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When she saw the surprise party, she was completely dumbstruck.
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The beauty of the sunset left me dumbstruck, unable to look away.