treacherous

[trech-er-uhs]
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:
1300–50; Middle English trecherous < Anglo-French, equivalent to trecher deceiver (trech(ier) to deceive + -er -er2) + -ous -ous. Cf. French tricheur trickster

treacherously, adverb
treacherousness, noun
untreacherous, adjective
untreacherously, adverb
untreacherousness, noun


1. unfaithful, faithless, treasonous. 2. deceitful.


1. loyal. 2. reliable.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
treacherous (ˈtrɛtʃərəs)
 
adj
1.  betraying or likely to betray faith or confidence
2.  unstable, unreliable, or dangerous: treacherous weather; treacherous ground
 
'treacherously
 
adv
 
'treacherousness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

treacherous
early 14c., from O.Fr. trecheros (12c.), from trecheur, agent noun from trechier "to cheat, trick" (see trick). Figuratively, of things, from c.1600.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Too bad many of the mines are in regions too dangerous or geographically
  treacherous for companies to set up camp.
The conversation about the value of a degree has taken a treacherous turn.
Also, those mentors can help weed out the treacherous people to work for.
Chaos villains are an especially treacherous breed because of their random
  words and actions.
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