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2 definitions found
 for treacherously
From The Collaborative International Dictionary of English v.0.48 :

  Treacherous \Treach"er*ous\, a. [See Treacher.]
     Like a traitor; involving treachery; violating allegiance or
     faith pledged; traitorous to the state or sovereign;
     perfidious in private life; betraying a trust; faithless.
     [1913 Webster]
           Loyal father of a treacherous son.       --Shak.
     [1913 Webster]
           The treacherous smile, a mask for secret hate.
     [1913 Webster]
     Syn: Faithless; perfidious; traitorous; false; insidious;
          [1913 Webster] -- Treach"er*ous*ly, adv. --
          Treach"er*ous*ness, n.
          [1913 Webster]

From WordNet (r) 3.0 (2006) :

      adv 1: in a disloyal and faithless manner; "he behaved
             treacherously"; "his wife played him false" [syn:
             faithlessly, traitorously, treacherously,
             treasonably, false]

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