WordNet (r) 3.0 (2006):

disadvantaged
    adj 1: marked by deprivation especially of the necessities of
           life or healthful environmental influences; "a childhood
           that was unhappy and deprived, the family living off
           charity"; "boys from a deprived environment, wherein the
           family life revealed a pattern of neglect, moral
           degradation, and disregard for law" [syn: deprived,
           disadvantaged]

Moby Thesaurus II by Grady Ward, 1.0:

72 Moby Thesaurus words for "disadvantaged":
   beggared, beggarly, bereaved, bereft, chronic poor,
   chronic poverty area, common, demeaning, depressed,
   depressed class, depressed population, deprived, fleeced,
   ghetto-dwellers, ghettoized, humble, impoverished, in need,
   in rags, in the shade, in want, indigent, inferior, infra dig,
   junior, less, lesser, low, lower, lowly, mendicant, minor, modest,
   necessitous, needy, on relief, ordinary, out at elbows, outcasts,
   pauperized, poverty subculture, poverty-stricken, second rank,
   second string, secondary, servile, slum-dwellers, starveling,
   stripped, sub, subaltern, subject, subordinate, subservient,
   the disadvantaged, the dispossessed, the distressed,
   the down-and-out, the forgotten man, the have-nots, the needy,
   the other America, the poor, the powerless, the underprivileged,
   the urban poor, third rank, third string, underdeveloped nation,
   underprivileged, vulgar, welfare rolls