YOU SAID:
you are a very dumb person
INTO JAPANESE
あなたはとても愚かな人です
BACK INTO ENGLISH
you are very stupid
INTO JAPANESE
あなたはとても愚かです
BACK INTO ENGLISH
you are so stupid
INTO JAPANESE
あなたはとても愚かです
BACK INTO ENGLISH
you are so stupid
That didn't even make that much sense in English.