imposture

plural impostures

1. countableuncountableThe act or conduct of an impostor; deception practiced under a false or assumed character; fraud or imposition.

   Among an unenlightened people every impoſture is likely to take place, for ignorance is the parent of credulity.

   1774, [Oliver] Goldsmith, “Of the Earliest State of Greece”, in The Grecian History, from the Earliest State to the Death of Alexander the Great, volume I, London: […] J[ohn] and F[rancis] Rivington, […], →OCLC, page 1

   2 more examples

   There is something very horrible in the laugh of a dying man: Hovering on the verge of both worlds, he seems to give the lie to both, and proclaim the enjoyments of one, and the hopes of another, alike an imposture.

   1820, [Charles Robert Maturin], Melmoth the Wanderer: A Tale. […], volume I, Edinburgh: […] Archibald Constable and Company, and Hurst, Robinson, and Co., […], →OCLC, page 292

   "I thought that you were a genuine mathematician—I vouched for it," replied Sir Fergus with more regret than anything else. "And the extent of your achievement has been to contrive a vulgar imposture—in the guise of an ingenious inventor to swindle society by a sham automaton that doesn't even work."

   1923, Ernest Bramah [pseudonym; Ernest Brammah Smith], “(please specify the page)”, in The Eyes of Max Carrados, London: Grant Richards, →OCLC

   Synonyms: cheating