treach·er·y

[trech-uh-ree]
noun, plural treach·er·ies.
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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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
treachery (ˈtrɛtʃərɪ) [Click for IPA pronunciation guide]
 
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
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00:10
Treachery is always a great word to know.
So is flibbertigibbet. Does it mean:
a stew of meat, vegetables, potatoes, etc.
a chattering or flighty, light-headed person.
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
But their friendly gestures often were rewarded with treachery.
He can devise tales of others' treachery and of the cruelness of fate to
  explain away his defeat.
He did not mention the local treachery or the lapses of officers who might have
  helped that day.
He'd heard tales of treachery, duplicity, and outright thuggery.
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