Source : Webster's Revised Unabridged Dictionary (1913)

Rotten \Rot"ten\, a. [Icel. rotinn; akin to Sw. rutten, Dan.
   radden. See {Rot}.]
   Having rotted; putrid; decayed; as, a rotten apple; rotten
   meat. Hence:
   (a) Offensive to the smell; fetid; disgusting.

             You common cry of curs! whose breath I hate As reek
             of the rotten fens.                  --Shak.
   (b) Not firm or trusty; unsound; defective; treacherous;
       unsafe; as, a rotten plank, bone, stone. ``The deepness
       of the rotten way.'' --Knolles.

   {Rotten borough}. See under {Borough}.

   {Rotten stone} (Min.), a soft stone, called also {Tripoli}
      (from the country from which it was formerly brought),
      used in all sorts of finer grinding and polishing in the
      arts, and for cleaning metallic substances. The name is
      also given to other friable siliceous stones applied to
      like uses.

   Syn: Putrefied; decayed; carious; defective; unsound;
        corrupt; deceitful; treacherous. -- {Rot"ten*ly}, adv.
        -- {Rot"ten*ness}, n.

Source : WordNet®

rotten
     adj 1: very bad; "a lousy play"; "it's a stinking world" [syn: {icky},
             {crappy}, {lousy}, {shitty}, {stinking}, {stinky}]
     2: having rotted or disintegrated; usually implies foulness;
        "dead and rotten in his grave" [ant: {unrotten}]
     3: damaged by decay; hence unsound and useless; "rotten floor
        boards"; "rotted beams"; "a decayed foundation" [syn: {decayed},
         {rotted}]