leprechaunish

tending to or exhibiting reckless playfulness he broke into a leprechaunish grin at the mere thought of his devilish plan for revenge Synonyms arch, devilish, elvish, espiègle, impish, knavish, mischievous, pixie (also pixy), pixieish, prankish, puckish, rascally, 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