<p><strong>Adjective</strong></p><ul><li>Characterized by lack of seriousness or sense: frivolous conduct.</li><li>Self-indulgently carefree; unconcerned about or lacking any serious purpose.</li><li>(Of a person) given to trifling or undue levity: a frivolous, empty-headed person.</li><li>Of little or no weight, worth, or importance; not worthy of serious notice: a frivolous suggestion.</li></ul><p><strong>Synonyms</strong></p><ul><li>Puerile, childish, foolish, silly, idle, flimsy, trivial, paltry, petty, trifling, light.</li></ul><p><strong>Antonyms</strong></p><ul><li>Serious, weighty.</li></ul>