Synonyms of merry

1 Syllable
gay, joyous, fun, mad, glad, boon, funs, wild
2 Syllables
bonny, coltish, larkish, sunny, playful, funnier, tickled, go-go, chirpy, jollying, funny, blither, genial, jovial, blithest, festal, sporting, happy, rocking, comic, punning, jolly, blithe, jumping, tipsy, larking, gleeful, grooving, jocund, mirthful, perky, riotous, zappy, zingy, joyful, funniest, happiest, cheerful, gladdest, bonnier, jollier, pleasant, zippy, jokey, gogo, waggish, tipsier, happier
3 Syllables
panglossian, rollicking, gladsome, humorous, carefree, lighthearted, livelier, winsome, enjoyable, lightsome, vivacious, gut-busting, hilarious, back-slapping, comical, light-hearted, sportive, fun-loving, rip-roaring, backslapping, jocular, amusing, boisterous, convivial, liveliest, festive, facetious, uproarious, lively, jocose
4 Syllables
rose-colored, frolicsome, good-humored, optimistic, high-spirited, glad-handering, conversible, blithesome, saturnalian, conversable, entertaining, unconstrained
5 Syllables
carnivalesque, sportspersonlike