modified
animated, brisk, lively, light, nimble, agile, quick, jaunty, spry, dapper, bright, spirited, energetic, vivacious, lighthearted, buoyant, frolicsome, playful, coltish, cheerful, gay, jolly, blithe, saucy, cheery, bouncy, perky, airy, chipper*.
Antonyms dull*, morose, lethargic. See syn. study at agile, lively.agile, lively.