- devilish, rascally, roguish - playful in an appealingly bold way; "a roguish grin"
Antonyms: unplayful, serious, sober (indirect, via playful)
- rascally, roguish, scoundrelly, blackguardly - lacking principles or scruples; "the rascally rabble"; "the tyranny of a scoundrelly aristocracy" - W.M. Thackaray; "the captain was set adrift by his roguish crew"
Antonyms: honest, honorable (indirect, via dishonest)