lacking enlightenment or knowledge or culture.
“But we live in benighted times,” said Dain. “And I am, as Miss Trent will assure you, the most benighted of men. I have, among other quaint beliefs, the antiquated notion that if I pay for something, it ought to belong to me. Since I seem to have no choice but to pay for Miss Trent—”
Chase, Loretta (2009-10-13). Lord of Scoundrels (pp. 134-135). Harper Collins, Inc.. Kindle Edition.
Definition from http://www.onelook.com/?w=benighted&ls=a