WordNet sense 1 (a member of an uncivilized people):

savage

WordNet sense 2 (a crude uncouth ill-bred person lacking culture or refinement):

boor, churl, peasant, tike, tyke, Goth

WordNet sense 3 (without civilizing influences):

barbaric, uncivilized, wild, uncivilised

WordNet sense 4 (not having a high state of culture and social development):

noncivilised, noncivilized