I can't understand it at all

I can't understand it at all
I can't understand it at all

I can't understand it at all
我一点也不明白这是什么意思
at all 是“一点也不”的意思
understand是“明白”的意思

我完全不明白！

俺压根不懂。

我完全不能理解
词组 not at all