Impostor

n. One who imposes; an imposer. [Rare.]

[Lat. impostor, a deceiver, from imponere, to impose upon, deceive; It. impostore, Sp. & Pg. impostor, Fr. imposteur.] One who imposes upon others; a person who assumes a character for the purpose of deception; a deceiver under a false character; a pretender. “The fraudulent impostor foul.” Milton. Syn.— Deceiver; cheat; rogue. See DECEIVER.