The Collaborative International Dictionary of English v.0.48:

Ill-bred \Ill"-bred`\, a.
   Badly educated or brought up; impolite; incivil; rude. See
   Note under Ill, adv.
   [1913 Webster]

WordNet (r) 3.0 (2006):

ill-bred
    adj 1: (of persons) lacking in refinement or grace [syn: ill-
           bred, bounderish, lowbred, rude, underbred,
           yokelish]

Moby Thesaurus II by Grady Ward, 1.0:

46 Moby Thesaurus words for "ill-bred":
   Gothic, Neanderthal, animal, barbarian, barbaric, barbarous,
   bestial, boorish, brutal, brutish, caddish, coarse, crude,
   impolite, inconsiderate, insensitive, loutish, louty, nasty,
   noncivilized, offensive, outlandish, primitive, rough-and-ready,
   savage, tactless, troglodytic, uncivil, uncivilized, uncombed,
   uncouth, uncultivated, uncultured, unfeminine, ungenteel, ungentle,
   ungentlemanly, unkempt, unladylike, unlicked, unpolished,
   unrefined, unsolicitous, untamed, vulgar, wild