What is 'Sei bello ma non sai nulla' when translated from Italian to English?

"You're handsome, but you don't know anything!" is an English equivalent of the Italian phrase Sei bello, ma non sai nulla! The second person informal singular present indicative, masculine singular adjective, conjunction, adverb, second person informal singular present indicative, and masculine singular noun also translate into English as "You're good-looking, but you know nothing!" The pronunciation will be "SEH-ee BEL-lo ma non seye NOOL-la" in Italian.