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Definition of imposture : The act or conduct of an impostor; deception practiced under a false or assumed character; fraud or imposition; cheating.

Synonyms:

guile, blind, caricature, art, cheat, personation, dodge, deception, cunning, finesse, wile, machination, subterfuge, ruse, hoax, contrivance, sleight, trick, shenanigan, feint, maneuver, ploy, stratagem, means, craft, jig, invention, artifice, take-in, honest

charade, falseness, fakery, fraud, disguise, masquerade, deceit, front, forgery, imitation, pose, cover, show, mannerism, affectation, guise, claim, stage, impersonation, counterfeit, bluff, air, ostentation, pretense, gimmick, pretension, device, artificiality, facade

fraudulent, pretentious, masquerading, affected, forced, ostentatious, ersatz, la-di-da, forged, mock, stagy, impersonating, stilted, showy, bogus, overdone, histrionic, posing, artificial, theatrical, synthetic, stiff, unnatural, mannered, fake, deceitful, false, studied

Usage examples:

• Such a letter from me, confessing my imposture and everything, would free you from the slightest taint of suspicion that you had been in any way a party to the scheme, and, of course, as Nessa and I should be in safety, I could make the confession with absolute impunity.
• He can hardly be acquitted of some form of more or less pious imposture. - "Roman Society from Nero to Marcus Aurelius", Samuel Dill.
• Having no sort of intention of keeping up the imposture, even if he could, and being fearful lest the exposure of his wealth and education would, in her present state, alienate her affections, he proposes by practical demonstration to disgust her with the mode of life which she designs to lead. - "Punch, or the London Charivari, May 6, 1914", Various.