devilish

Adverb
  1. In a playfully devilish manner (synset 400303492)
    "the socialists are further handicapped if they believe that capitalists are not only wicked but also devilishly clever"
Adjective
  1. Showing the cunning or ingenuity or wickedness typical of a devil (synset 301136874)
    "devilish schemes"; "the cold calculation and diabolic art of some statesmen"; "the diabolical expression on his face"; "a mephistophelian glint in his eye"
  2. Playful in an appealingly bold way (synset 302129677)
    "a roguish grin"

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