WordWeb Online

1. (informal) small and of little importance
   "piffling efforts"
   - fiddling, footling, lilliputian, little, niggling, piddling, petty, picayune [N. Amer], trivial

1. Speak (about unimportant matters) rapidly and incessantly
   - chatter, palaver, prate, tittle-tattle, twaddle, clack, maunder, prattle, blab, gibber, tattle, blabber, gabble, rabbit [Brit], witter [Brit], yabber [Brit]
    
2. Act in a trivial or ineffective way

See also: unimportant

Type of: act, behave, do, mouth, speak, talk, utter, verbalise [Brit], verbalize