frivolous

1 lacking importance judges are getting sick of people bringing frivolous lawsuits Synonyms fiddling, foolish, unimportant, incidental, inconsequential, inconsiderable, insignificant, little, Mickey Mouse, minor, minute, negligible, nugatory, slight, small, small-fry, trifling, trivialRelated Words jerkwater, one-horse; nickel-and-dime, paltry, petty, small-time, worthless; anonymous, nameless, obscure, uncelebrated, unknownNear Antonyms decisive, fatal, fateful; chief, dominant, overbearing, overmastering, overriding, principal; distinctive, exceptional, impressive, outstanding, prominent, remarkable; valuable, worthwhile, worthy; distinguished, eminent, great, illustrious, preeminent, prestigious; famous, notorious, renowned; all-important, basic, essential, fundamental, keyAntonyms big, consequential, eventful, important, major, material, meaningful, momentous, significant, substantial, unfrivolous, weighty

2 lacking in seriousness or maturity when asked by the waiter if we wanted anything else that evening, we made a frivolous request for free drinks Synonyms birdbrained, ditzy (or ditsy), dizzy, featherbrained, flighty, giddy, frothy, futile, goofy, harebrained, light-headed, light-minded, puerile, scatterbrained, silly, yeastyRelated Words fatuous, foolish, inane, nonsensical, thoughtless, witless; crazy, daffy, daft, fruity; exuberant, flippant, fluttery, giggly, happy, light, lighthearted, playful; sappy, shallow, superficialNear Antonyms grave, melancholy, somber (or sombre), thoughtful; dignified, heavy, no-nonsense, sedate, severe, solemn, staidAntonyms earnest, serious, serious-minded, sober, unfrivolous