The Collaborative International Dictionary of English v.0.48:

Offend \Of*fend\, v. t. [imp. & p. p. Offended; p. pr. & vb.
   n. Offending.] [OF. offendre, L. offendere, offensum; ob
   (see Ob-) + fendere (in comp.) to thrust, dash. See
   Defend.]
   1. To strike against; to attack; to assail. [Obs.] --Sir P.
      Sidney.
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   2. To displease; to make angry; to affront.
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            A brother offended is harder to be won than a strong
            city.                                 --Prov. xviii.
                                                  19.
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   3. To be offensive to; to harm; to pain; to annoy; as, strong
      light offends the eye; to offend the conscience.
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   4. To transgress; to violate; to sin against. [Obs.]
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            Marry, sir, he hath offended the law. --Shak.
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   5. (Script.) To oppose or obstruct in duty; to cause to
      stumble; to cause to sin or to fall. [Obs.]
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            Who hath you misboden or offended.    --Chaucer.
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            If thy right eye offend thee, pluck it out . . . And
            if thy right hand offend thee, cut it off. --Matt.
                                                  v. 29, 3O.
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            Great peace have they which love thy law, and
            nothing shall offend them.            --Ps. cxix.
                                                  165.
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WordNet (r) 3.0 (2006):

offending
    adj 1: offending against or breaking a law or rule; "contracts
           offending against the statute were canceled" [ant:
           unoffending]