Antonyms for staid

restrained, set:

sporting, indecorous, excited, fun, adventurous, willing, frivolous.

noun:

senseless, screwball, fatuous, facetious, Weak-minded, sappy, balmy, uncouth, crazy, lunatic, Daffy, absurd, mad, lighthearted, cuckoo, preposterous, vulgar, foolish, nonsensical, flippant, loony, flip, zany, improper, nutty, wacky, indelicate, unseemly, asinine, kooky, hilarious, jerky, witless, daft, brainless, kittenish, jocular, undignified, uproarious, cockeyed, unwise, light, jesting, dotty, joking, crass, insane, half-witted.