Dictionary definition · devilish
adjective
- showing the cunning or ingenuity or wickedness typical of a devil"devilish schemes"
- playful in an appealingly bold way"a roguish grin"
adverb
- in a playfully devilish manner"the socialists are further handicapped if they believe that capitalists are not only wicked but also devilishly clever"
Source: Open English WordNet (CC BY 4.0).