This book is boring to the nth degree.

这本书无聊透顶。

This is the nth time I've told you to do your homework carefully.

不知告诉你少回了, 做作业要认真。

Not only was he an excellent musician, he was also a gentleman to the nth degree.

他不仅是一出色的音乐家，更是一真正的绅士。

I told him, for the nth time, to tidy his room but he’s done nothing to it at all.

跟他不知少次了，让他把屋子打扫乾净，可他压根儿没动一根手指头。