Synonyms for Gabble (same or very similar meaning)
WordNet sense 1 (rapid and indistinct speech):
jabber, jabberingWordNet sense 2 (speak (about unimportant matters) rapidly and incessantly):
blab, blabber, chatter, clack, gibber, maunder, palaver, piffle, prate, prattle, tattle, tittle-tattle, twaddleFrom the ODE community, based on WordNetadd/edit