rascally

tending to or exhibiting reckless playfulness those rascally boys had let all of the lab mice out of their cages Synonyms arch, devilish, elvish, espiègle, impish, knavish, leprechaunish, pixie (also pixy), pixieish, prankish, puckish, mischievous, roguish, scampish, sly, tricksy, waggish, wickedRelated Words antic, coltish, coy, frisky, frolicsome, kittenish, playful, sportful, sportive; gay, happy, lighthearted, whimsical; energetic, lively, spirited, sprightly; artful, crafty, cunning, trickish, tricky, wily; misbehaving, naughty, troublemaking; pestering, riling, teasingNear Antonyms grave, grim, sedate, sober, solemn, staid, stern