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Definition of impostor : One who imposes upon others; a person who assumes a character or title not his own, for the purpose of deception; a pretender.

Synonyms:

fakir, thespian, fraudulence, cheat, imposter, pseudo, actor, quacksalver, phoney, pretender, crook, role player, dupery, put-on, hypocrite, quack, con artist, brown-nose, skulker, fixer, conman, study at quack, juke, charlatan, postiche, sham, impersonator, fake, pseud, faker, malingerer, dissembler, hoaxer, masquerader, mountebank, true, sharper, wheeler-dealer, histrion, dissimulator, humbug, hoax, deceiver, politician, liar, fraud, ringer, phony, player, shammer

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