Trea·son·a·ble a. Pertaining to treason; consisting of treason; involving the crime of treason, or partaking of its guilt.
     Most men's heads had been intoxicated with imaginations of plots and treasonable practices.   --Clarendon.
  Syn: -- Treacherous; traitorous; perfidious; insidious.
  --Trea*son*a*ble*ness, n. -- Trea*son*a*bly, adv.
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  treasonably
       adv : in a disloyal and faithless manner; "he behaved
             treacherously"; "his wife played him false" [syn: faithlessly,
              traitorously, treacherously, false]