The Collaborative International Dictionary of English v.0.48:

Self-denying \Self`-de*ny"ing\, a.
   Refusing to gratify one's self; self-sacrificing. --
   Self`-de*ny"ing*ly, adv.
   [1913 Webster]

WordNet (r) 3.0 (2006):

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

Moby Thesaurus II by Grady Ward, 1.0:

43 Moby Thesaurus words for "self-denying":
   Albigensian, Catharist, Franciscan, Sabbatarian, Trappist,
   Waldensian, abstinent, altruistic, anchoritic, ascetic, austere,
   committed, consecrated, dedicated, devoted, disinterested,
   eremitic, flagellant, humble, mendicant, modest, puritanical,
   rigoristic, sacrificing, self-abasing, self-abnegating,
   self-abnegatory, self-devoted, self-effacing, self-forgetful,
   self-immolating, self-neglectful, self-neglecting, self-renouncing,
   self-sacrificing, self-unconscious, selfless, unacquisitive,
   unpossessive, unpretentious, unselfish, unsparing of self,
   wedded to poverty