Aback
Definition 1 of 1

Unexpected Events
Use 'aback' when something happens that is so surprising it makes someone temporarily confused or bewildered.

The sudden resignation of the manager took everyone aback.
Emotional Impact
Conveys a strong emotional response, usually related to surprise or shock, not just a casual reaction.

I was taken aback by the sheer number of people at the rally.
Negative Surprise
Often implies a negative connotation, suggesting the surprise is not pleasant or welcome.

She was taken aback when she found out she was being laid off.
Compare with
astonishbewilderdumbfoundflabbergastnonplussedstartlesurprise, surprisethunderstruck
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