Antonyms for solemn

impressive, sacred:

irreligious.

quiet, serious:

joyful, funny, thoughtless, ignorant, usual, insignificant, excited, ordinary, trivial, happy, frivolous, light, unthoughtful, lively, unimportant, unsacred, laughing, cheerful, unimpressive.

noun:

jerky, cockeyed, hopeful, light, screwball, foolish, cheery, mad, joyous, encouraging, unwise, improper, sappy, heartwarming, crass, bright, undignified, mean, despicable, insane, blithe, wacky, crude, jocund, hilarious, uncouth, merry, crazy, festive, indecent, sunshiny, unseemly, loony, lighthearted, senseless, nutty, mirthful, kooky, jolly, Daffy, fatuous, buoyant, lightsome, witless, lowly, base, asinine, lunatic, humble, half-witted, cordial, commonplace, joking, kittenish, cuckoo, cheerful, nonsensical, Weak-minded, coarse, jesting, joyful, uproarious, optimistic, comforting, beggarly, cheering, contemptible, balmy, brainless, daft, paltry, zany, inferior, friendly, blithesome, dotty, vulgar.