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
Also, precipitation can make the road treacherously slick.
Shady areas and bridge surfaces can be treacherously icy even when other
  sections of roadway are not.
Precipitation can make the road treacherously slick, so use caution during
  inclement weather.
Fallen timber impeded their progress across the treacherously steep ridges,
  while snow and lack of food depleted their strength.
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