frivolity in WordNet English dictionary

1. something of little value or significance
   bagatelle  fluff  frippery  frivolity 
   
2. acting like a clown or buffoon
   buffoonery  clowning  japery  frivolity  harlequinade  prank 
   
3. the trait of being frivolous; not serious or sensible
   frivolity  frivolousness