definition of
devilish

[1] #1 devilish s. [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". wn

[2] #2 devilish r. [devilishly] in a playfully devilish manner; "the socialists are further handicapped if they believe that capitalists are not only wicked but also devilishly clever". wn

[3] #3 devilish s. [rascally, roguish] playful in an appealingly bold way; "a roguish grin". wn