Pronunciation: (friv'u-lus),[key] —adj. 1. characterized by lack of seriousness or sense: frivolous conduct. 2. self-indulgently carefree; unconcerned about or lacking any serious purpose.
3. (of a person) given to trifling or undue levity: a frivolous, empty-headed person. 4. of little or no weight, worth, or importance; not worthy of serious notice: a frivolous suggestion.