noun
a person who pretends to be something they are not, especially in order to impress others
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The art critic labeled him as a poseur for his pretentious display of abstract paintings.
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She's such a poseur, always trying to act like she knows more than she does.
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That guy at the party was a total poseur, trying too hard to fit in with the cool crowd.
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In the world of fashion, being a poseur can be more damaging to your reputation than being genuinely uncool.