From Longman Dictionary of Contemporary Englishdevilishdev‧il‧ish /ˈdevəlɪʃ/ adjective1BAD BEHAVIOUR OR ACTIONS literary very bad, difficult, or unpleasantdevilish schemes to cheat people2seeminglikely to cause trouble, but in a way that is amusing or attractiveDalton looked at her with a devilish grin.Examples from the Corpusdevilish• That lack of balance too is devilish.• Charlton Heston plays Perry, complete with devilishbeard, and he does everything but cackle with delight over his evilness.• Costner, with his easygrin, incipientbeerbelly, thinning hair and brightdevilish eyes, plays broken-down convincingly.• A sound enough plan in theory, but in practice it turned out to be a devilish job.• We were cast into impenetrable blackness, with the rain still cascading down and that devilish thing on the loose!• The girl was alone and devilishthoughts were playing on his mind.