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Adjective: devilish  de-vu-lish
  1. Showing the cunning, ingenuity or wickedness typical of a devil
    "devilish schemes";
    - diabolic, diabolical, mephistophelian, mephistophelean
  2. Playful in an appealingly bold way
    "a devilish grin";
    - rascally, roguish
Adverb: devilish  de-vu-lish
  1. In a playfully devilish manner
    - devilishly

See also: evil, ludic [formal], playful

Encyclopedia: Devilish