a lack of knowledge or information about something widespread ignorance of/about the disease They fought a long battle against prejudice and ignorance. She was kept in ignorance of her husband's activities. Children often behave badly out of/through ignorance. I hate to admit my ignorance, but how does it work?
Idioms if you do not know about something, you cannot worry about it Some doctors believe ignorance is bliss and don't give their patients all the facts. See ignorance in the Oxford Advanced Learner's Dictionary
