Try Our Apps
Dictionary.com

follow Dictionary.com

The Best Internet Slang

treachery

[trech-uh-ree] /ˈtrɛtʃ ə ri/
noun, plural treacheries.
1.
violation of faith; betrayal of trust; treason.
2.
an act of perfidy, faithlessness, or treason.
Origin of treachery
1175-1225
1175-1225; Middle English trecherie < Middle French, Old French, equivalent to trech(ier) to deceive + -erie -ery
Antonyms
1. loyalty.
Synonym Study
1. See disloyalty.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
Cite This Source
Examples from the Web for treachery
Contemporary Examples
Historical Examples
  • How could Robert have learned anything of his treachery to his father?

    Brave and Bold Horatio Alger
  • I should like to meet him face to face, and charge him with his treachery.

    Brave and Bold Horatio Alger
  • He came a little toward the girl who had accused him of treachery.

    Within the Law Marvin Dana
  • It was not long before they had to pay a heavy penalty for their treachery and inconstancy.

  • It after wards appears that the scheme of Rumi-naui was one of treachery.

    Apu Ollantay Anonymous
British Dictionary definitions for treachery

treachery

/ˈtrɛtʃərɪ/
noun (pl) -eries
1.
the act or an instance of wilful betrayal
2.
the disposition to betray
Word Origin
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
Cite This Source
Word Origin and History for treachery
n.

early 13c., from Old French trecherie "deceit, cheating" (12c.), from trechier "to cheat, deceive" (see trick).

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source

Word of the Day

Difficulty index for treachery

Most English speakers likely know this word

Word Value for treachery

0
16
Scrabble Words With Friends

Nearby words for treachery