The Collaborative International Dictionary of English v.0.48:

Corrupt \Cor*rupt"\, v. t. [imp. & p. p. Corrupted; p. pr. &
   vb. n. Corrupting.]
   1. To change from a sound to a putrid or putrescent state; to
      make putrid; to putrefy.
      [1913 Webster]

   2. To change from good to bad; to vitiate; to deprave; to
      pervert; to debase; to defile.
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            Evil communications corrupt good manners. --1. Cor.
                                                  xv. 33.
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   3. To draw aside from the path of rectitude and duty; as, to
      corrupt a judge by a bribe.
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            Heaven is above all yet; there sits a Judge
            That no king can corrupt.             --Shak.
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   4. To debase or render impure by alterations or innovations;
      to falsify; as, to corrupt language; to corrupt the sacred
      text.
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            He that makes an ill use of it [language], though he
            does not corrupt the fountains of knowledge, . . .
            yet he stops the pines.               --Locke.
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   5. To waste, spoil, or consume; to make worthless.
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            Lay not up for yourselves treasures upon earth,
            where moth and rust doth corrupt.     --Matt. vi.
                                                  19.
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WordNet (r) 3.0 (2006):

corrupting
    adj 1: seducing into corrupt practices
    2: harmful to the mind or morals; "corrupt judges and their
       corrupting influence"; "the vicious and degrading cult of
       violence" [syn: corrupting, degrading]
    3: that infects or taints [syn: corrupting, contaminating]

Moby Thesaurus II by Grady Ward, 1.0:

38 Moby Thesaurus words for "corrupting":
   baleful, baneful, corroding, corrosive, corruptive,
   counterproductive, damaging, deadly, deleterious, detrimental,
   disadvantageous, disserviceable, distressing, eroding, erosive,
   harmful, hurtful, injurious, lethal, malefic, malevolent, malign,
   malignant, mischievous, noisome, noxious, ominous, pernicious,
   poisonous, prejudicial, scatheful, toxic, venenate, veneniferous,
   venenous, venomous, vicious, virulent