The Collaborative International Dictionary of English v.0.48:

Uncultured \Uncultured\
   See cultured.

WordNet (r) 3.0 (2006):

uncultured
    adj 1: (of persons) lacking art or knowledge [syn: artless,
           uncultivated, uncultured]

Moby Thesaurus II by Grady Ward, 1.0:

122 Moby Thesaurus words for "uncultured":
   Gothic, Neanderthal, Philistine, animal, arrested, backward,
   barbarian, barbaric, barbarous, bestial, bookless, boorish, brutal,
   brutish, churlish, cloddish, clodhopping, clownish, coarse,
   countrified, country-born, country-bred, crass, crude, deceived,
   embryonic, farmerish, from the sticks, functionally illiterate,
   grammarless, gross, hayseed, heathen, hick, hicky, hobnailed,
   hoodwinked, ill-bred, ill-educated, illiterate, impolite,
   in embryo, in ovo, in the rough, inurbane, led astray, loutish,
   lowbred, lowbrow, lumpen, lumpish, misinformed, misinstructed,
   mistaught, noncivilized, nonintellectual, outlandish, oversimple,
   pagan, primitive, raw, reductionistic, reductive, rough,
   rough-and-ready, roughcast, roughhewn, rube, rude, rudimental,
   rudimentary, savage, simplistic, stunted, troglodytic, unblown,
   unbooked, unbookish, unbooklearned, unbriefed, uncivil,
   uncivilized, uncombed, uncouth, uncultivated, uncut,
   underdeveloped, undeveloped, unedified, uneducated, unerudite,
   unfashioned, unfinished, unformed, unguided, unhewn, uninstructed,
   unintellectual, unkempt, unlabored, unlearned, unlettered,
   unlicked, unliterary, unpolished, unprocessed, unread, unrefined,
   unscholarly, unschooled, unstudious, untamed, untaught, untreated,
   untutored, unworked, unwrought, up-country, vulgar, wild, yokel,
   yokelish