The Collaborative International Dictionary of English v.0.48:

Disoblige \Dis`o*blige"\, v. t. [imp. & p. p. Disobliged; p.
   pr. & vb. n. Disobliging.] [Pref. dis- + oblige: cf. F.
   d['e]sobliger.]
   1. To do an act which contravenes the will or desires of; to
      offend by an act of unkindness or incivility; to
      displease; to refrain from obliging; to be unaccommodating
      to.
      [1913 Webster]

            Those . . . who slight and disoblige their friends,
            shall infallibly come to know the value of them by
            having none when they shall most need them. --South.
      [1913 Webster]

            My plan has given offense to some gentlemen, whom it
            would not be very safe to disoblige.  --Addison.
      [1913 Webster]

   2. To release from obligation. [Obs.]
      [1913 Webster]

            Absolving and disobliging from a more general
            command for some just and reasonable cause.
                                                  --Milton.
      [1913 Webster]

WordNet (r) 3.0 (2006):

disoblige
    v 1: to cause inconvenience or discomfort to; "Sorry to trouble
         you, but..." [syn: trouble, put out, inconvenience,
         disoblige, discommode, incommode, bother]
    2: ignore someone's wishes [ant: accommodate, oblige]

Moby Thesaurus II by Grady Ward, 1.0:

33 Moby Thesaurus words for "disoblige":
   affront, bother, call names, disaccommodate, disadvantage,
   discommode, dishonor, dump on, fleer at, flout, gibe at,
   give offense to, harm, humiliate, hurl a brickbat, impose upon,
   incommode, inconvenience, insult, jeer at, jibe at, mock, offend,
   outrage, put about, put down, put out, put to inconvenience,
   put to trouble, scoff at, taunt, treat with indignity, trouble