Adjective frivolous has 1 sense

1. frivolous - not serious in content or attitude or behavior; "a frivolous novel"; "a frivolous remark"; "a frivolous young woman"
   Antonyms: serious, capital, earnest, in earnest, sincere, grave, sedate, sober, solemn, overserious, real, sensible, thoughtful, sobering
   

Frivolous

Adjective

1. Lacking in seriousness; unworthy of serious attention or concern.

Example sentence: She always seemed to be involved in some frivolous activity instead of focusing on her studies.

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Adjective

2. Not having any useful purpose or value; trifling.

Example sentence: Buying yet another pair of shoes would be a frivolous expense.

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Noun

1. A frivolous person; someone who lacks seriousness or is carefree.

Example sentence: She was considered a frivolous among her colleagues, always bringing humor and laughter to the office.

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Adverb

1. In a frivolous manner; with lack of seriousness or importance.

Example sentence: He spent his money frivolously, never thinking about saving for the future.