The Collaborative International Dictionary of English v.0.48:

Uninstructed \Uninstructed\
   See instructed.

WordNet (r) 3.0 (2006):

uninstructed
    adj 1: lacking information or instruction; "lamentably
           unenlightened as to the laws" [syn: uninstructed,
           unenlightened, naive]

Moby Thesaurus II by Grady Ward, 1.0:

51 Moby Thesaurus words for "uninstructed":
   Gothic, Philistine, barbarous, benighted, bookless, deceived,
   empty-headed, functionally illiterate, grammarless, heathen,
   hoodwinked, ill-educated, illiterate, incognizant, know-nothing,
   led astray, lowbrow, misinformed, misinstructed, mistaught,
   nonintellectual, oblivious, pagan, rude, unacquainted, unaware,
   unbooked, unbookish, unbooklearned, unbriefed, uncultivated,
   uncultured, unedified, uneducated, unerudite, unfamiliar, unguided,
   uninformed, unintellectual, unknowing, unlearned, unlettered,
   unliterary, unread, unrefined, unscholarly, unschooled, unstudious,
   untaught, untutored, unwitting