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Definition of treacherous:

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


adventurous, treasonable, venturous, hairy, undependable, faithless, safety, chancy, recreant, false-hearted, unfaithful, perfidious, false, unsafe, continue, trust, parlous, untrue, dangerous, unreliable, Punic, faithless, false, venturesome.

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