follow Dictionary.com

Is it sneaked or snuck?

treacherous

[trech-er-uh s] /ˈtrɛtʃ ər əs/
adjective
1.
characterized by faithlessness or readiness to betray trust; traitorous.
2.
deceptive, untrustworthy, or unreliable.
3.
unstable or insecure, as footing.
4.
dangerous; hazardous:
a treacherous climb.
Origin of treacherous
1300-1350
1300-50; Middle English trecherous < Anglo-French, equivalent to trecher deceiver (trech(ier) to deceive + -er -er2) + -ous -ous. Cf. French tricheur trickster
Related forms
treacherously, adverb
treacherousness, noun
untreacherous, adjective
untreacherously, adverb
untreacherousness, noun
Synonyms
1. unfaithful, faithless, treasonous. 2. deceitful.
Antonyms
1. loyal. 2. reliable.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
Cite This Source
Examples from the web for treacherous
British Dictionary definitions for treacherous

treacherous

/ˈtrɛtʃərəs/
adjective
1.
betraying or likely to betray faith or confidence
2.
unstable, unreliable, or dangerous: treacherous weather, treacherous ground
Derived Forms
treacherously, adverb
treacherousness, noun
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 treacherous
adj.

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.

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source

Word of the Day

Difficulty index for treacherous

Many English speakers likely know this word

Word Value for treacherous

0
17
Scrabble Words With Friends

Nearby words for treacherous