prattle

(noun) idle or foolish and irrelevant talk. Synonyms: prate, idle talk, blether, chin music.

(verb) speak (about unimportant matters) rapidly and incessantly. Synonyms: chatter, piffle, palaver, prate, tittle-tattle, twaddle, clack, maunder, blab, gibber, tattle, blabber, gabble.