The Collaborative International Dictionary of English v.0.48:

Mangle \Man"gle\, v. t. [imp. & p. p. Mangled; p. pr. & vb. n.
   Mangling.] [A frequentative fr. OE. manken to main, AS.
   mancian, in bemancian to mutilate, fr. L. mancus maimed;
   perh. akin to G. mangeln to be wanting.]
   1. To cut or bruise with repeated blows or strokes, making a
      ragged or torn wound, or covering with wounds; to tear in
      cutting; to cut in a bungling manner; to lacerate; to
      mutilate.
      [1913 Webster]

            Mangled with ghastly wounds through plate and mail.
                                                  --Milton.
      [1913 Webster]

   2. To mutilate or injure, in making, doing, or performing;
      as, to mangle a piece of music or a recitation.
      [1913 Webster]

            To mangle a play or a novel.          --Swift.
      [1913 Webster]

WordNet (r) 3.0 (2006):

mangled
    adj 1: having edges that are jagged from injury [syn:
           lacerate, lacerated, mangled, torn]

Moby Thesaurus II by Grady Ward, 1.0:

60 Moby Thesaurus words for "mangled":
   aggravated, broken, burned, burst, busted, butchered, castrated,
   checked, chipped, cleft, cloven, cracked, crazed, cut, cut short,
   damaged, deteriorated, docked, embittered, exacerbated, garbled,
   harmed, hashed, hurt, impaired, imperfect, in bits, in pieces,
   in shards, in shreds, injured, irritated, lacerate, lacerated,
   lopped, mutilated, quartered, ragged, rent, riven, ruptured,
   scalded, scorched, severed, shattered, shredded, slashed, slit,
   smashed, splintered, split, sprung, tattered, the worse for, torn,
   truncated, weakened, worse, worse off, worsened