adverb
modifies a verb, adjective, or another adverb to describe how something is done
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She behaved unbecomingly at the formal dinner, causing quite a scandal.
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He was dressed unbecomingly for the job interview, wearing ripped jeans and a t-shirt.
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She acted unbecomingly at the party, getting into a fight with another guest.
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His words were unbecomingly harsh, leaving a lasting impact on the team morale.