ignorance; lack of knowledge or awareness — can be neutral (not knowing) or pejorative (stating someone's lack of ability).
無知を恥じるよりも、知らないことを学ぶ姿勢が大事だ。
Rather than being ashamed of ignorance, it's important to have the attitude to learn what you don't know.
専門用語を多用すると、無知な人には理解できない。
Using a lot of jargon makes it impossible for uninformed people to understand.
彼の発言は無知を露呈してしまった。
His remark exposed his ignorance.