The Collaborative International Dictionary of English v.0.48:

Uneducated \Uneducated\
   See educated.

WordNet (r) 3.0 (2006):

uneducated
    adj 1: not having a good education [ant: educated]

Moby Thesaurus II by Grady Ward, 1.0:

56 Moby Thesaurus words for "uneducated":
   Gothic, Philistine, barbarous, benighted, bookless, colloquial,
   common, conversational, deceived, empty-headed, everyday, familiar,
   functionally illiterate, grammarless, heathen, hoodwinked,
   ignorant, ill-educated, illiterate, informal, know-nothing,
   led astray, lowbrow, misinformed, misinstructed, mistaught,
   nonintellectual, nonstandard, pagan, rude, spoken, substandard,
   unbooked, unbookish, unbooklearned, unbriefed, uncultivated,
   uncultured, unedified, unenlightened, unerudite, unguided,
   uninstructed, unintellectual, unlearned, unlettered, unliterary,
   unread, unrefined, unscholarly, unschooled, unstudied, unstudious,
   untaught, untutored, vernacular