What is the meaning of ignorant?

adjective

• Uneducated in general; lacking knowledge or sophistication.
  • usage: "an ignorant man"; "nescient of contemporary literature"; "an unlearned group incapable of understanding complex issues"; "exhibiting contempt for his unlettered companions"
  • synonyms: nescient, unlearned, unlettered
• Uneducated in the fundamentals of a given art or branch of learning; lacking knowledge of a specific field.
  • usage: "she is ignorant of quantum mechanics"; "he is musically illiterate"
  • synonyms: illiterate
• Unaware because of a lack of relevant information or knowledge.
  • usage: "he was completely ignorant of the circumstances"; "an unknowledgeable assistant"; "his rudeness was unwitting"
  • synonyms: unknowledgeable, unknowing, unwitting