1. devilish, diabolic, diabolical, mephistophelean, mephistophelian

showing the cunning or ingenuity or wickedness typical of a devil

Example Sentences:
'devilish schemes'
'the cold calculation and diabolic art of some statesmen'
'the diabolical expression on his face'
'a mephistophelian glint in his eye'

Synonyms

• diabolic
• diabolical
• mephistophelean
• mephistophelian

2. devilish, rascally, roguish

playful in an appealingly bold way

Example Sentences:
'a roguish grin'

Synonyms

• rascally
• roguish

3. devilish, devilishly

in a playfully devilish manner

Example Sentences:
'the socialists are further handicapped if they believe that capitalists are not only wicked but also devilishly clever'

Synonyms

• devilishly