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Adjective: unenlightened  ,ún-in'lI-tund
  1. Not enlightened; ignorant
    "the devices by which unenlightened men preserved the unjust social order"
     
  2. Lacking knowledge in a particular field
    "lamentably unenlightened as to the laws";
    - uninstructed, naive, naïve

See also: benighted, dark, uneducated, uninformed

Antonym: enlightened