1. (adj) devilish, diabolic, diabolical, mephistophelian, mephistophelean
showing the cunning or ingenuity or wickedness typical of a devil
Synonyms: mephistophelian, rascally, hellish, unholy, infernal, fiendish, satanic, roguish, diabolic, devilish, mephistophelean, demonic, diabolical
Antonyms: sober, good, unplayful, serious
2. (adverb) devilish, rascally, roguish
playful in an appealingly bold way
Synonyms: mephistophelian, rascally, blackguardly, roguish, scoundrelly, diabolic, devilish, mephistophelean, diabolical
Antonyms: unplayful, serious, good, sober
3. (adverb) devilishly, devilish
in a playfully devilish manner
Synonyms: madly, insanely, diabolically, fiendishly, deucedly, deadly, devilish, devilishly
Antonyms: serious, good, sober, unplayful
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Synonyms for devilish 
