Impostor (?), n. [L. impostor a deceiver, fr. imponere to impose upon, deceive. See Impone.] One who imposes upon others; a person who assumes a character or title not his own, for the purpose of deception; a pretender. “The fraudulent impostor foul.” Milton.

Syn. -- Deceiver; cheat; rogue. See Deceiver.
[1913 Webster]