Etymology
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poseur (n.)

"one who practices affected attitudes," 1866, from French poseur, from verb poser "affect an attitude or pose," from Old French poser "to put, place, set" (see pose (v.1)). The word is English poser in French garb, and thus could itself be considered an affectation.

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Definitions of poseur

poseur (n.)
a person who habitually pretends to be something he is not;
Synonyms: poser
From wordnet.princeton.edu