何とも言いようがないなあ。の英語

I just don't know what to say.

I can't say for sure.

I cannot say.

I can't say.

There is no way of expressing it―It is unspeakable―unutterable.

That's hard to say.

It's not worth mentioning.

I don't know what to say.

I'm at a loss for words.

I can't say anything.

I have nothing to say.

I have no more [I've said all I have] to say to you.

No comment!

What can I say about it?

I have nothing to say about it.

I am not certain [sure].

I can't say for certain.

There's nothing left to talk about.

Don't say anything.

Say nothing.

I have nothing special to say.

I told you so!

（文頭に置けば）―There is no saying―（文尾に置けば）―for aught one knows―（独立句に用いれば）―Who knows?―God knows―（形容詞に用いれば）―unspeakable sorrow―inexpressible feeling―indescribable beauty―unutterable grief―ineffable joy―indefinable charm―exquisite pleasure

Who knows?

God knows.

I have nothing further to say.

You can have nothing to complain of―nothing to grumble at.

I have nothing more to say.

Can't say anything

You know what it is.