YOU SAID:

I really think that you are a foolish person, possibly an idiot.

INTO JAPANESE

私は本当にあなたが愚かな人だと思います。

BACK INTO ENGLISH

I really think you are a stupid person.

INTO JAPANESE

本当にバカな人だと思います。

BACK INTO ENGLISH

I think you are really stupid.

INTO JAPANESE

あなたは本当に愚かだと思います。

BACK INTO ENGLISH

I think you are really stupid.