无须知道的英文怎么写

you don't have to know你没必要知道，语气比较强硬
口语中，一般用：
you don't wanna know

比如《freaky Friday》里面，魔法被解除了，林赛罗汉的继父问她妈妈，what's going on? 这究竟怎么回事？林赛的母亲说：trust me, you don't want know.相信我，你没必要知道。

it is a unnecessaried thing you want to know.

要看是谁“无须知道”，若是你:You've no need to know.
若是我：i've no need to know

Do not have to know