WordNet sense 1 (willing to deprive yourself):

self-sacrificing, self-giving

WordNet sense 2 (disregarding your own advantages and welfare over those of others):

unselfish

WordNet sense 3 (used especially of behavior):

renunciant, renunciative, self-abnegating

WordNet sense 4 (characterized by strictness, severity, or restraint):

strict, nonindulgent