treachery

[ trech-uh-ree ]
/ ˈtrɛtʃ ə ri /

noun, plural treach·er·ies.

violation of faith; betrayal of trust; treason.
an act of perfidy, faithlessness, or treason.

Origin of treachery

1175–1225; Middle English trecherie < Middle French, Old French, equivalent to trech(ier) to deceive + -erie -ery

Synonym study

1. See disloyalty.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for treachery

treachery

/ (ˈtrɛtʃərɪ) /

noun plural -eries

the act or an instance of wilful betrayal
the disposition to betray

Word Origin for treachery

C13: from Old French trecherie, from trechier to cheat; compare trick
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012