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plural poseurs
One who affects some behaviour, style, attitude or other condition, often to impress or influence others. quotations examples
But he was also, what seems almost incompatible with this ferocious truthfulness, excessively self-conscious and morally attitudinising, a thin-skinned poseur.
1884, Vernon Lee (pseudonym; Violet Paget), The Countess of Albany, published 1910, page 67
I am a poseur and I don't care / I like to make people stare
1978, Poly Styrene (lyrics and music), “I Am a Poseur”, in Germ Free Adolescents, performed by X-Ray Spex