YOU SAID:
you are the slowest person in the whole entire world
INTO JAPANESE
あなたは全世界で最も遅い人です
BACK INTO ENGLISH
You are the slowest person in the world
INTO JAPANESE
あなたは世界で最も遅い人です
BACK INTO ENGLISH
You are the slowest person in the world
That didn't even make that much sense in English.