benighted — If you describe people or the place where they live as benighted, you think they are unfortunate or do not know anything.
catachrestic — Constituting or related to catachresis.
solecism — a nonstandard or ungrammatical usage, as unflammable and they was.
unenlightened — to give intellectual or spiritual light to; instruct; impart knowledge to: We hope the results of our research will enlighten our colleagues.
ungrammatical — grammatically incorrect or awkward; not conforming to the rules or principles of grammar or accepted usage: an ungrammatical sentence.
uninstructed — not instructed; uninformed; uneducated.
unlearned — not learned; not scholarly or erudite.
unlettered — not educated; uneducated; untutored; ignorant.