Source : Webster's Revised Unabridged Dictionary (1913)

Disappoint \Dis`ap*point"\, v. t. [imp. & p. p. {Disapointed};
   p. pr. & vb. n. {Disappointing}.] [OF. desapointier, F.
   d['e]sappointer; pref. des- (L. dis-) + apointier, F.
   appointier, to appoint. See {Appoint}.]
   1. To defeat of expectation or hope; to hinder from the
      attainment of that which was expected, hoped, or desired;
      to balk; as, a man is disappointed of his hopes or
      expectations, or his hopes, desires, intentions,
      expectations, or plans are disappointed; a bad season
      disappoints the farmer of his crops; a defeat disappoints
      an enemy of his spoil.

            I was disappointed, but very agreeably. --Macaulay.

   Note: Disappointed of a thing not obtained; disappointed in a
         thing obtained.

   2. To frustrate; to fail; to hinder of result.

            His retiring foe Shrinks from the wound, and
            disappoints the blow.                 --Addison.

   Syn: To tantalize; fail; frustrate; balk; baffle; delude;
        foil; defeat. See {Tantalize}.