treachery

[trech-uh-ree]
noun, plural treacheries.
1.
violation of faith; betrayal of trust; treason.
2.
an act of perfidy, faithlessness, or treason.

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


1. See disloyalty.


1. loyalty.
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World English Dictionary
treachery (ˈtrɛtʃərɪ)
 
n , pl -eries
1.  the act or an instance of wilful betrayal
2.  the disposition to betray
 
[C13: from Old French trecherie, from trechier to cheat; compare trick]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

treachery
early 13c., from O.Fr. trecherie "deceit, cheating" (12c.), from trechier "to cheat, deceive" (see trick).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
He'd heard tales of treachery, duplicity, and outright thuggery.
He can devise tales of others' treachery and of the cruelness of fate to
  explain away his defeat.
But their opinions were widely excoriated as treachery and defeatism.
He did not mention the local treachery or the lapses of officers who might have
  helped that day.
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