1. [adj]  lacking general education or knowledge; "an ignorant man"; "nescient of contemporary literature"; "an unlearned group incapable of understanding complex issues"; "exhibiting contempt for his unlettered companions"
2. [adj]  not enlightened; ignorant; "the devices by which unenlightened men preserved the unjust social order"
3. [adj]  lacking information or instruction; "lamentably unenlightened as to the laws"

UNENLIGHTENED is a 13 letter word that starts with U.