1. not enlightened; ignorant - the devices by which unenlightened men preserved the unjust social order • Ant: enlightened • Similar to: benighted, dark • See Also: uneducated, uninformed 2. lacking information or instruction - lamentably unenlightened as to the laws • Syn: uninstructed, naive • Similar to: uninformed • Derivationally related forms: naiveness (for: naive)