flabbergasted -
To be surprised, amazed, or shocked very unexpectedly
Lucille was flabbergasted when she arrived at her classroom Tuesday morning for another day of teaching, and her 4th grade students had made a surprise birthday party for her.
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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!
adjective
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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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divulge -
To reveal something secret or private, to make known information that was previously hidden.
The company wouldn't divulge any details about the new product, and it would be top secret until it came out.