WordWeb Online

1. The trait of being frivolous; not serious or sensible
   - frivolousness
    
2. Something of little value or significance
   - bagatelle, fluff, frippery
    
3. Acting like a clown or buffoon
   - buffoonery, clowning, japery, harlequinade, prank

Derived forms: frivolities

See also: frivolous

Type of: craziness, folly, foolery, indulgence, lunacy, small beer, tomfoolery, trait, trifle, trivia, triviality

Antonym: seriousness