YOU SAID:

I don't even know what you are talking about; that is so stupid.

INTO JAPANESE

あなたが何を話しているのかわからない。それはとても愚かです。

BACK INTO ENGLISH

I do not know what you are talking about. It's so stupid.

INTO JAPANESE

あなたが話していることは分かりません。それはとても愚かです。

BACK INTO ENGLISH

I do not know what you are talking about. It's so stupid.