The Collaborative International Dictionary of English v.0.48:

Unlearned \Un*learn"ed\, a. [Pref. un- + learned.]
   1. Not learned; untaught; uneducated; ignorant; illiterate.
      [1913 Webster]

   2. Not gained by study; not known.
      [1913 Webster]

   3. Not exhibiting learning; as, unlearned verses.
      [1913 Webster] -- Un*learn"ed*ly, adv. --
      Un*learn"ed*ness, n.
      [1913 Webster]

WordNet (r) 3.0 (2006):

unlearned
    adj 1: not established by conditioning or learning; "an
           unconditioned reflex" [syn: unconditioned, innate,
           unlearned] [ant: conditioned, learned]
    2: not well learned
    3: uneducated in general; lacking knowledge or sophistication;
       "an ignorant man"; "nescient of contemporary literature"; "an
       unlearned group incapable of understanding complex issues";
       "exhibiting contempt for his unlettered companions" [syn:
       ignorant, nescient, unlearned, unlettered]

Moby Thesaurus II by Grady Ward, 1.0:

51 Moby Thesaurus words for "unlearned":
   Gothic, Philistine, automatic, barbarous, bookless, deceived,
   functionally illiterate, grammarless, heathen, hoodwinked,
   ill-educated, illiterate, impulsive, inherent, innate, instinctive,
   involuntary, led astray, libidinal, lowbrow, misinformed,
   misinstructed, mistaught, natural, nonintellectual, pagan, rude,
   spontaneous, subliminal, unbooked, unbookish, unbooklearned,
   unbriefed, unconscious, uncultivated, uncultured, unedified,
   uneducated, unerudite, unguided, uninstructed, unintellectual,
   unlettered, unliterary, unread, unrefined, unscholarly, unschooled,
   unstudious, untaught, untutored