Synonyms of devilish

Adjective

1. devilish, diabolic, diabolical, mephistophelian, mephistophelean, evil (vs. good)

usage: 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"

2. devilish, rascally, roguish, playful (vs. unplayful)

usage: playful in an appealingly bold way; "a roguish grin"

Adverb

1. devilishly, devilish

usage: in a playfully devilish manner; "the socialists are further handicapped if they believe that capitalists are not only wicked but also devilishly clever"

Definition and meaning of devilish (Dictionary)