treach·​ery | \ ˈtre-chə-rē How to pronounce treachery (audio) , ˈtrech-rē \
plural treacheries

Definition of treachery

1 : violation of allegiance or of faith and confidence : treason
2 : an act of perfidy or treason

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Examples of treachery in a Sentence

a tale of treachery and revenge was furious that she revealed his secret and never forgave her for the treachery
Recent Examples on the Web For others, the specter of electoral defeat meant the delegitimization of the democratic order completely, lost in a red mist of treachery. Talia Lavin, The New Republic, "The Violent Crescendo of the MAGA Conspiracies," 6 Jan. 2021 The story is taut and filled with treachery, but the book is also a revealing study of the various suspects — and of Smiley himself, who learns during his investigation that his wife has had an affair with the mole. Matt Schudel, Washington Post, "John le Carré, who lifted the spy novel to literature, dies at 89," 13 Dec. 2020 The magnificent final half-hour intercuts a performance of Cavalleria Rusticana with another horrific montage of Michael’s inescapable treachery. Armond White, National Review, "The Godfather Coda Mixes Crime, Politics, and Religion," 4 Dec. 2020 The chickens come home to roost in Fargo’s finale, bringing to a close a season of treachery and murder. Nick Schager,, "Fargo finale recap: The victors write their history," 30 Nov. 2020 Denson opens the book with an FBI agent having a terrible day as his team fails repeatedly while trying to obtain evidence of Ames’ treachery. oregonlive, "True-crime series for kids features 2010 plot to bomb Portland tree lighting ceremony," 25 Nov. 2020 The treachery that Trump had always suspected in others might finally be coming for him. Susan B. Glasser, The New Yorker, "Donald Trump’s Day of Reckoning," 7 Nov. 2020 And through it all, in every direction, the land was stained by treachery, bloodshed, and betrayal. Scott Eisen, National Geographic, "400 years on, the Pilgrims get a reality check," 11 Nov. 2020 Only a Trump victory will suitably chasten the many sensible and somewhat highbrow Reagan Republicans who deserted Trump for reasons ranging from outright treachery to tactical misjudgment to mere snobbery. Conrad Black, National Review, "Hell, Yes," 28 Oct. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'treachery.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of treachery

13th century, in the meaning defined at sense 1

History and Etymology for treachery

Middle English trecherie, from Anglo-French, from trecher, tricher to deceive, from Vulgar Latin *triccare — more at trick entry 1

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Time Traveler for treachery

Time Traveler

The first known use of treachery was in the 13th century

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Statistics for treachery

Last Updated

11 Jan 2021

Cite this Entry

“Treachery.” Dictionary, Merriam-Webster, Accessed 22 Jan. 2021.

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More Definitions for treachery


How to pronounce treachery (audio)

English Language Learners Definition of treachery

: harmful things that are done usually secretly to a friend, your own country, etc.
: an act of harming someone who trusts you


treach·​ery | \ ˈtre-chə-rē How to pronounce treachery (audio) \
plural treacheries

Kids Definition of treachery

1 : the behavior of a person who betrays trust or faith a tale of treachery and revenge
2 : an act or instance of betraying trust or faith She was hurt by her friend's treacheries.

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