The Collaborative International Dictionary of English v.0.48:

Garble \Gar"ble\, v. t. [imp. & p. p. Garbled; p. pr. & vb. n.
   Garbling.] [Formerly, to pick out, sort, OF. grabeler, for
   garbeler to examine precisely, garble spices, fr. LL.
   garbellare to sift; cf. Sp. garbillar to sift, garbillo a
   coarse sieve, L. cribellum, dim. of cribrum sieve, akin to
   cernere to separate, sift (cf. E. Discern); or perh. rather
   from Ar. gharb[=a]l, gharbil, sieve.]
   1. To sift or bolt, to separate the fine or valuable parts of
      from the coarse and useless parts, or from dros or dirt;
      as, to garble spices. [Obs.]
      [1913 Webster]

   2. To pick out such parts of as may serve a purpose; to
      mutilate; to pervert; as, to garble a quotation; to garble
      an account.
      [1913 Webster]

WordNet (r) 3.0 (2006):

garbled
    adj 1: lacking orderly continuity; "a confused set of
           instructions"; "a confused dream about the end of the
           world"; "disconnected fragments of a story"; "scattered
           thoughts" [syn: confused, disconnected, disjointed,
           disordered, garbled, illogical, scattered,
           unconnected]

Moby Thesaurus II by Grady Ward, 1.0:

123 Moby Thesaurus words for "garbled":
   affected, aimless, apocryphal, artificial, assumed, bastard,
   beyond one, biased, bogus, brummagem, butchered, castrated,
   catachrestic, colorable, colored, complex, complicated, cooked,
   counterfeit, counterfeited, crabbed, cramp, cut short, designless,
   difficult, distorted, docked, doctored, dressed up, dummy,
   eisegetical, embellished, embroidered, empty, ersatz, factitious,
   fake, faked, falsified, feigned, fictitious, fictive, hard,
   hard to understand, hashed, illegitimate, imitation, importless,
   inane, inauthentic, insignificant, intricate, jumbled, junky,
   knotty, lopped, make-believe, man-made, mangled, meaningless,
   misapprehended, miscited, misconceived, misconstrued,
   misinterpreted, misquoted, misread, misreported, misrepresented,
   misstated, mistaken, misunderstood, mock, mutilated,
   nonconnotative, nondenotative, null, obfuscated, obscure, obscured,
   overtechnical, perplexed, perverted, phatic, phony, pinchbeck,
   pretended, pseudo, purportless, purposeless, put-on, quasi, queer,
   scrambled, self-styled, senseless, sham, shoddy, simulated,
   slanted, so-called, soi-disant, spurious, strained, supposititious,
   synthetic, tin, tinsel, titivated, tortured, tough, truncated,
   twisted, unauthentic, unauthoritative, unfounded, ungenuine,
   unmeaning, unnatural, unreal, unreliable, unsignificant, warped