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treacherous

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treach⋅er⋅ous

  [trech-er-uhs]
Use treacherous in a Sentence
–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; ME trecherous < AF, equiv. to trecher deceiver (trech(ier) to deceive + -er -er 2 ) + -ous -ous. Cf. F tricheur trickster

Related forms:
treach⋅er⋅ous⋅ly, adverb
treach⋅er⋅ous⋅ness, 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. 2009.
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treach·er·ous   (trěch'ər-əs)   
adj.  

  1. Marked by betrayal of fidelity, confidence, or trust; perfidious. See Synonyms at faithless.

  2. Not to be relied on; not dependable or trustworthy.

  3. Marked by unforeseen hazards; dangerous or deceptive: treacherous waters.

treach'er·ous·ly adv., treach'er·ous·ness n.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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