1. (adj)ignorant, nescient, unlearned, unlettered uneducated in general; lacking knowledge or sophistication
"an ignorant man"; "nescient of contemporary literature"; "an unlearned group incapable of understanding complex issues"; "exhibiting contempt for his unlettered companions"
2. (adj)ignorant, illiterate uneducated in the fundamentals of a given art or branch of learning; lacking knowledge of a specificfield "she is ignorant of quantum mechanics"; "he is musically illiterate"
3. (adj)ignorant, unknowledgeable, unknowing, unwitting unaware because of a lack of relevant information or knowledge "he was completely ignorant of the circumstances"; "an unknowledgeable assistant"; "his rudeness was unwitting"