全然気にしない.
I don't care a hill of beans.
I don't care a bean.
私は全然気にしない
I don't care a pin.
I don't mind that.
気にしないよ。
Who would care?
気にせずに
the act of taking no notice of something
I don't care about that at all.
Never mind about that.
気にするなよ。
もう気にしない。
I don't care anymore.