Synonyms of frivolous

1 Syllable

light, gay, flip

2 Syllables

childish, trifling, flighty, giddy, playful, pointless, sillier, skittish, idle, shallow, flightier, minor, punning, niggling, silly, dingdong, quick-fix, aimless, scratcher, dizzy, idlest, flippant, madcap, silliest, pettier, pettiest, barmy, zipper, shucker, lippy, ditzy, foolish, trivial, paltry, petty, swimmy, flightiest, fickler

3 Syllables

low-ranking, lightheaded, senseless, light-minded, nonserious, unprofound, inanest, unguided, inane, smattery, sportive, puerile, idiotic, whimsical, birdbrained, time-wasting, judgmental, facetious, picayune

4 Syllables

unimportant, agitable, impractical, harebrained, muddleheaded, volatile, alarmable, peripheral, juvenile, arbitrary, nickel-and-dime, penny-ante, empty-headed, featherbrained, tongue-in-cheek, unnotable, superficial, scatterbrained

5 Syllables

ill-considered

6 Syllables

one-dimensional, inconsiderable