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

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.