dumbstruck -
So shocked or surprised as to be unable to speak.
When Bill heard on the phone that the storm had destroyed his summer house, he was dumbstruck, and didn't know how to respond.
verb
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startle -
To cause a person or animal to feel sudden shock or alarm
The speeding car startled Victor, and he had just enough time to jump out of the way.
adjective
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appalled -
Filled with dismay or disgust, especially at something morally wrong.
We were appalled at the cost of the car repairs—it was far too high!
verb
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astound -
To cause others to be very surprised or shocked
The American public was astounded by the revelations about Watergate that were revealed by Woodward and Bernstein in the Washington Post.
noun
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mystery -
Something that is difficult or impossible to understand or explain, a person or thing that arouses curiosity or wonder because it is unknown or puzzling.
The cause of the strange noise in the attic remains a mystery.
adjective
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telltale -
Revealing or indicating something hidden or secret, showing the inner nature of something.
The telltale clouds of smoke hinted at a fire nearby.