Adjective
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playful in an appealingly bold way
"a roguish grin"
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showing the cunning or ingenuity or wickedness typical of a devil
"devilish schemes"
"the cold calculation and diabolic art of some statesmen"
"the diabolical expression on his face"
"a mephistophelian glint in his eye"
- mephistophelian - mephistophelean
Adverb
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in a playfully devilish manner
"the socialists are further handicapped if they believe that capitalists are not only wicked but also devilishly clever"