- characterized by faithlessness or readiness to betray trust; traitorous.
- deceptive, untrustworthy, or unreliable.
- unstable or insecure, as footing.
- dangerous; hazardous: a treacherous climb.
Origin of treacherous
SynonymsSee more synonyms for treacherous on Thesaurus.com
Examples from the Web for treacherous
True, we travel this treacherous road at our own risk, but … *** Bob Weir: “If you want something for nothing, go jerk off.”The Stacks: Grateful Dead I Have Known
August 30, 2014
Big scary Transformer-like robots with heads ablaze that frighten the kids back across the treacherous desert?The So-Called Immigration Border Crisis Is Neither
July 10, 2014
Treacherous thatched-roof-haired drag-queen Linda Tripp, with those dress-for-success shoulder pads?How Monica Lewinsky Changed the Media
May 9, 2014
Unsurprisingly, treacherous murmurings are starting to be heard again of the crown skipping a generation.How 2012 Turned Into a Very Bad Year For Prince Charles
November 26, 2012
The place where the Constitution meets religion and race remains a treacherous cultural battleground.The Constitution and the Candidates: Race, Religion, Romney, and Ryan
Akhil Reed Amar
August 19, 2012
Or he will be killed by falling stones or a treacherous blizzard.Ancient Man
Hendrik Willem van Loon
A man who was kind to a horse could not be treacherous to a man, Andrew decided.Way of the Lawless
Mingwe was the name by which they were known to other tribes, and means "stealthy," "treacherous."The Trail Book
It would be treacherous, now that he's helpless to forbid me.It Happened in Egypt
C. N. Williamson
The other gods knew that the treacherous Loki had done it, and did not blame Hodur.Classic Myths
Mary Catherine Judd
- betraying or likely to betray faith or confidence
- unstable, unreliable, or dangeroustreacherous weather; treacherous ground
Word Origin and History for treacherous
early 14c., from Old French trecheros (12c.), from trecheur, agent noun from trechier "to cheat, trick" (see trick). Figuratively, of things, from c.1600. Related: Treacherously; treacherousness.