The Collaborative International Dictionary of English v.0.48:

Unenlightened \Unenlightened\
   See enlightened.

WordNet (r) 3.0 (2006):

unenlightened
    adj 1: not enlightened; ignorant; "the devices by which
           unenlightened men preserved the unjust social order"
           [ant: enlightened]
    2: lacking information or instruction; "lamentably unenlightened
       as to the laws" [syn: uninstructed, unenlightened,
       naive]

Moby Thesaurus II by Grady Ward, 1.0:

59 Moby Thesaurus words for "unenlightened":
   ableptical, amaurotic, awkward, benighted, bereft of light,
   blankminded, blind, callow, color-blind, dark, dim-sighted, dumb,
   empty, empty-headed, eyeless, gauche, green, groping, hemeralopic,
   ignorant, in darkness, inane, inexperienced, innocent,
   know-nothing, mind-blind, naive, nescient, nyctalopic, raw,
   rayless, sightless, simple, spiritually blind, stark blind,
   stone-blind, strange to, tentative, unacquainted, unapprized,
   uncomprehending, unconversant, undiscerning, unfamiliar,
   unilluminated, uninformed, uninitiated, unintelligent, unknowing,
   unobserving, unperceiving, unposted, unprogressive, unripe,
   unseeing, unsure, unversed, vacuous, visionless