Source : Webster's Revised Unabridged Dictionary (1913)

Self-denying \Self`-de*ny"ing\, a.
   Refusing to gratify one's self; self-sacrificing. --
   {Self`-de*ny"ing*ly}, adv.

Source : WordNet®

self-denying
     adj 1: willing to deprive yourself [syn: {self-giving}, {self-sacrificing}]
     2: used especially of behavior [syn: {renunciant}, {renunciative},
         {self-abnegating}]