不清楚，不了解 用英语怎么说？

I'm not （really) sure 吧。

I have no idea about it， 和 I don't know 都是完全不知道的意思。

你的意思是“模棱两可”或者“含糊”吧？

模棱两可

1.in an equivocal way; on the line
2.double-edged; two-faced; equivocal; evasive; ambiguous
3.to cut both ways

含糊

[Informal] ambiguous; vague; uncertain; indefinite

I don't know.
or
I'm not clear.
or
I have no idea about it

楼上的不是吧 连这个都不知道 哈哈哈 楼主我告诉你啊

应该是 I don't know

:) hope that helps

i'm not sure

I don't know it clearly.
我不太清楚