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Synonyms
treach·er·ous (trĕch́ər-əs)

adjective 

  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.

derivatives

treach́er·ous·ly
adverb
treach́er·ous·ness
noun