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frivolous

 
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
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