Source : Webster's Revised Unabridged Dictionary (1913)

Disfavor \Dis*fa"vor\, n. [Pref. dis- + favor: cf. OF.
   disfaveur, F. d['e]faveur.] [Written also {disfavour}.]
   1. Want of favor of favorable regard; disesteem; disregard.

            The people that deserved my disfavor. --Is. x. 6
                                                  (1551).

            Sentiment of disfavor against its ally. --Gladstone.

   2. The state of not being in favor; a being under the
      displeasure of some one; state of unacceptableness; as, to
      be in disfavor at court.

   3. An unkindness; a disobliging act.

            He might dispense favors and disfavors. --Clarendon.

Source : WordNet®

disfavour
     n 1: the state of being out of favor; "he is in disfavor with the
          king" [syn: {disfavor}]
     2: an inclination to withhold approval from some person or
        group [syn: {disfavor}, {dislike}, {disapproval}]
     v : put at a disadvantage; hinder, harm; "This rule clearly
         disadvantages me" [syn: {disadvantage}, {disfavor}] [ant:
          {advantage}]