The Collaborative International Dictionary of English v.0.48:

Twaddle \Twad"dle\, v. i. & t. [See Twattle.]
   To talk in a weak and silly manner, like one whose faculties
   are decayed; to prate; to prattle. --Stanyhurst.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Twaddle \Twad"dle\, n.
   Silly talk; gabble; fustian.
   [1913 Webster]

         I have put in this chapter on fighting . . . because of
         the cant and twaddle that's talked of boxing and
         fighting with fists now-a-days.          --T. Hughes.
   [1913 Webster]

WordNet (r) 3.0 (2006):

twaddle
    n 1: pretentious or silly talk or writing [syn: baloney,
         boloney, bilgewater, bosh, drool, humbug,
         taradiddle, tarradiddle, tommyrot, tosh, twaddle]
    v 1: speak (about unimportant matters) rapidly and incessantly
         [syn: chatter, piffle, palaver, prate, tittle-
         tattle, twaddle, clack, maunder, prattle, blab,
         gibber, tattle, blabber, gabble]