1. (

• devilish ,
• diabolic ,
• diabolical ,
• mephistophelian ,
• mephistophelean

) 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 in an appealingly bold way; "a roguish grin" ;

1. (

• devilishly ,
• devilish

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