Not knowing; unfamiliar or unknown (indicates lack of knowledge or unfamiliarity).
その単語は聞いたことがなくて、意味を知らない。
I've never heard that word and don't know its meaning.
最近の映画はあまり詳しくないので、監督の名前も知らない。
I'm not very familiar with recent movies, so I don't even know the director's name.
その地域の習慣については知らないことが多い。
There are many things I don't know about the customs of that area.
An interjection expressing indifference or dismissal ('I don't care', 'whatever', or 'not my problem').
A: 「彼がまた遅刻したよ」 B: 「知らないよ、勝手にすれば。」
A: "He was late again." B: "I don't care — let him do as he likes."
そんなこと、知らない。自分でどうにかしてくれ。
I don't care about that. Deal with it yourself.
問題の責任を押し付けられても、私は知らないと言った。
Even when they tried to pin the blame on me, I said I didn't care / wasn't involved.