The Collaborative International Dictionary of English v.0.48:

Rubbish \Rub"bish\, a.
   Of or pertaining to rubbish; of the quality of rubbish;
   trashy. --De Quincey.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Rubbish \Rub"bish\, n. [OE. robows, robeux, rubble, originally
   an Old French plural from an assumed dim. of robe, probably
   in the sense of trash; cf. It. robaccia trash, roba stuff,
   goods, wares, robe. Thus, etymologically rubbish is the pl.
   of rubble. See Robe, and cf. Rubble.]
   Waste or rejected matter; anything worthless; valueless
   stuff; trash; especially, fragments of building materials or
   fallen buildings; ruins; d['e]bris.
   [1913 Webster]

         What rubbish and what offal!             --Shak.
   [1913 Webster]

         he saw the town's one half in rubbish lie. --Dryden.
   [1913 Webster]

   Rubbish pulley. See Gin block, under Gin.
      [1913 Webster]

WordNet (r) 3.0 (2006):

rubbish
    n 1: worthless material that is to be disposed of [syn:
         rubbish, trash, scrap]
    2: nonsensical talk or writing [syn: folderol, rubbish,
       tripe, trumpery, trash, wish-wash, applesauce,
       codswallop]
    v 1: attack strongly

Moby Thesaurus II by Grady Ward, 1.0:

181 Moby Thesaurus words for "rubbish":
   absurdity, afterglow, afterimage, amphigory, attack, babble,
   babblement, bad-mouth, balance, balderdash, baloney, bibble-babble,
   bilge, blabber, blather, bombast, bosh, bric-a-brac, bull,
   bullshit, bunk, bunkum, butt, butt end, candle ends, castaway,
   castoff, cattle, chaff, chicken feed, chickenshit, clamjamfry,
   claptrap, clobber, crap, criticize, debris, derelict, destroy,
   details, detritus, discard, dogie, double-talk, dregs,
   dregs of society, drivel, drool, dross, dust, end, eyewash,
   fag end, fiddle-faddle, fiddledeedee, filings, flapdoodle, flotsam,
   flotsam and jetsam, flummery, folderol, fossil, foundling,
   fragments, froth, fudge, fustian, gabble, galimatias, gammon,
   garbage, gibber, gibberish, gibble-gabble, gimcrackery,
   gobbledygook, hocus-pocus, hogwash, hokum, holdover, hooey, humbug,
   husks, jabber, jargon, jetsam, jump all over, jump on, junk,
   kelter, knickknackery, lagan, leavings, lees, leftovers, litter,
   lumber, malarkey, minutiae, moonshine, mumbo jumbo, narrishkeit,
   niaiserie, nonsense, odds and ends, offal, offscourings, offscum,
   orphan, orts, pack of nonsense, palaver, pan, pap, parings,
   peanuts, piffle, poppycock, prate, prattle, raff, rags, rant,
   refuse, reject, rejects, relics, remainder, remains, remnant,
   residue, residuum, rest, riffraff, rigamarole, rigmarole, roach,
   rodomontade, rot, rubble, ruins, rump, sawdust, scourings, scrap,
   scraps, scum, shadow, shavings, shoddy, skimble-skamble, slop,
   small beer, small change, sordes, straw, stubble,
   stuff and nonsense, stultiloquence, stump, survival, sweepings,
   swinish multitude, tommyrot, trace, trash, trifles, trivia, truck,
   trumpery, twaddle, twattle, twiddle-twaddle, vaporing, vermin,
   vestige, waffling, waif, waifs and strays, waste, wastrel



The Devil's Dictionary (1881-1906):

RUBBISH, n.  Worthless matter, such as the religions, philosophies,
literatures, arts and sciences of the tribes infesting the regions
lying due south from Boreaplas.