treachery

noun

treach·​ery ˈtre-chə-rē How to pronounce treachery (audio)
ˈtrech-rē
plural treacheries
1
: violation of allegiance or of faith and confidence : treason
2
: an act of perfidy or treason

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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
When does compromise become treachery or defeat? Literary Hub, 3 Sep. 2025 Could Juno be behind this treachery, as payback for David destroying her spy corporation and for changing his oldest daughter into a killer? Demetrius Patterson, HollywoodReporter, 27 Aug. 2025 Thus far, this prosecution, and a corresponding case against the gang in Sacramento, have been rife with evidence of treachery and violence inside and outside of prison. Nate Gartrell, Mercury News, 31 July 2025 That’s the treachery of this world, that’s the trap. Lauren Coates, Variety, 24 May 2025 See All Example Sentences for treachery

Word History

Etymology

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

First Known Use

13th century, in the meaning defined at sense 1

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

Browse Nearby Words

Cite this Entry

“Treachery.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/treachery. Accessed 11 Sep. 2025.

Kids Definition

treachery

noun
treach·​ery ˈtrech-(ə-)rē How to pronounce treachery (audio)
plural treacheries
1
: violation of allegiance or of faith and confidence : treason
2
: an act of treason

More from Merriam-Webster on treachery

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!