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Synonyms for Ignorant (same or very similar meaning)

WordNet sense 1 (unaware because of a lack of relevant information or knowledge):
unknowing, unwitting, unknowledgeable

WordNet sense 2 (not informed; lacking in knowledge or information):
uninformed

WordNet sense 3 (uneducated in general; lacking knowledge or sophistication):
nescient, unenlightened, unlearned, unlettered

WordNet sense 4 (uneducated in the fundamentals of a given art or branch of learning; lacking knowledge of a specific field):
illiterate

WordNet sense 5 (not having a good education):
uneducated


From the ODE community, based on WordNetadd/edit