The Collaborative International Dictionary of English v.0.48:

Botch \Botch\, v. t. [imp. & p. p. Botched; p. pr. & vb. n.
   Botching.] [See Botch, n.]
   1. To mark with, or as with, botches.
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            Young Hylas, botched with stains.     --Garth.
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   2. To repair; to mend; esp. to patch in a clumsy or imperfect
      manner, as a garment; -- sometimes with up.
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            Sick bodies . . . to be kept and botched up for a
            time.                                 --Robynson
                                                  (More's
                                                  Utopia).
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   3. To put together unsuitably or unskillfully; to express or
      perform in a bungling manner; to bungle; to spoil or mar,
      as by unskillful work.
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            For treason botched in rhyme will be thy bane.
                                                  --Dryden.
      [1913 Webster]

WordNet (r) 3.0 (2006):

botched
    adj 1: spoiled through incompetence or clumsiness; "a bungled
           job" [syn: bungled, botched]

Moby Thesaurus II by Grady Ward, 1.0:

40 Moby Thesaurus words for "botched":
   blighted, bungled, bungling, butchered, clumsy, deficient,
   destroyed, fumbled, half-assed, haphazard, hit-and-miss,
   hit-or-miss, ill-advised, ill-considered, ill-contrived,
   ill-devised, ill-done, ill-executed, ill-managed, impolitic,
   marred, messy, misconducted, misdirected, misguided, mismanaged,
   muffed, murdered, negligent, promiscuous, ruined, slipshod,
   slipshoddy, sloppy, slovenly, sluttish, spoiled, spoilt, untidy,
   wrecked