THESAURUS
talk nonsense
babble, blab, blabber, blather, blether, bull, bullshit, chat, chatter, clack, clatter, dither, drivel, drool, gab, gabble, gas, gibber, gibble-gabble, go on, gossip, gush, haver, jabber, jaw, natter, palaver, patter, piffle, pour forth, prate, prattle, ramble on, rattle, rattle on, reel off, run on, spout, spout off, talk away, talk on, tittle-tattle, twaddle, twattle, vapor, waffle, yak, yakkety-yak
ROGET THESAURUS
talk nonsense
Loquacity
VB
be loquacious, talk glibly, pour forth, patter, prate, palaver, prose, chatter, prattle, clack, jabber, jaw, blather, blatter, blether, rattle, rattle on, twaddle, twattle, babble, gabble, outtalk, talk oneself out of breath, talk oneself hoarse, expatiate, gossip, din in the ears, talk at random,
talk nonsense, be hoarse with talking.
Folly
VB
to be an imbecile, have no brains, have no sense, trifle, drivel, radoter, dote, ramble, play the fool, play the monkey, monkey around, fool around, take leave of one's senses (insanity), not see an inch beyond one's nose, stultify oneself,
talk nonsense.