adjective
not wanting or enjoying the company of others; not sociable
adverb
in an unsocial manner
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His unsocial behavior at the networking event was quite noticeable.
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She's always been a bit unsocial, preferring to stay home rather than go out with friends.
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I don't know why he's being so unsocial lately, maybe he's just in a bad mood.
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The unsocial atmosphere of the party made it hard for anyone to relax and have a good time.