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Thesaurus: treacherous

Like a traitor; involving treachery; violating allegiance or faith pledged; traitorous to the state or sovereign; perfidious in private life; betraying a trust; faithless.

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  1. a. Like a traitor; involving treachery; violating allegiance or faith pledged; traitorous to the state or sovereign; perfidious in private life; betraying a trust; faithless.
  2. adj. dangerously unstable and unpredictable
  3. adj. tending to betray; especially having a treacherous character as attributed to the Carthaginians by the Romans
  4. Like a traitor; involving treachery; violating allegiance or faith pledged; traitorous to the state or sovereign; perfidious in private life; betraying a trust; faithless. Loyal father of a treacherous son. Shak. The treacherous smile, a mask for secret hate. Cowper. Syn. -- Faithless; perfidious; traitorous; false; insidious; plotting. -- Treach"er*ous*ly, adv. -- Treach"er*ous*ness, n.
  5. Like a traitor; involving treachery; violating allegiance orfaith pledged; traitorous to the state or sovereign; perfidious inprivate life; betraying a trust; faithless.Loyal father of a treacherous son. Shak.The treacherous smile, a mask for secret hate. Cowper.
  6. j:100 s. dangerously unstable and unpredictable