“没完没了”的意思是一件事情一直不停止，好像永远做不完，让人觉得很烦。

The meaning of "没完没了" is that something never stops, as if it will never be finished, which makes people feel annoyed.

我们常常用它来说别人一直说话或者一直做同一件事。

We often use it to say that someone keeps talking or keeps doing the same thing.