Definitions of ignorant:

• adjective:   lacking information or knowledge
• adjective:   lacking basic knowledge

  Example: "How can someone that age be so ignorant?"

• adjective:   used of things; lacking sense or awareness

  Example: "Ignorant hope"

• adjective:   ignorant of the fundamentals of a given art or branch of knowledge

  Example: "Ignorant of quantum mechanics"

• adjective:   lacking general education or knowledge

  Example: "An ignorant man"

• adjective:   lacking knowledge or skill