YOU SAID:

You really ARE an idiot.

INTO JAPANESE

あなたは本当に、白痴が。

BACK INTO ENGLISH

You really are idiot.

INTO JAPANESE

あなたは本当に白痴です。

BACK INTO ENGLISH

You are a real idiot.

INTO JAPANESE

あなたは本当の白痴です。

BACK INTO ENGLISH

You are a real idiot.