我压根儿不知道他是什么意思。

I did not have the foggiest idea what he meant.

《柯林斯英汉双解大词典》

起初，我不知道 “exam” 这个词是什么意思。

At first, I did not know what the word "exam" meant.

youdao

我不知道，这算什么意思。

I know not what it means.

youdao

I don't know what that means-- like God or the gods favor me and so I'm lucky or this is my lucky day.

我不知道那是什么意思...,是说上帝或者众神眷顾我,所以我很幸运,或者说这是我的幸运日

耶鲁公开课 - 金融市场课程节选

Now I use the word "cult" and every year people look at me and say "what is cult? I don't even understand what that means."

在这里我用“祭仪“这个词，每一年人们都会问我,“什么是祭仪？我甚至不知道它是什么意思，“

耶鲁公开课 - 旧约导论课程节选

I don't need a prime minister.' I knew what he meant by that.

我不需要一个首相”,我知道他是什么意思。

普林斯顿公开课 - 国际座谈会课程节选