He is really stupid.
Chinese (Simplified) Translation
他真是个笨蛋。
Chinese (Traditional) Translation
他真的很笨。
Korean Translation
그는 정말 멍청하다.
Indonesian Translation
Dia benar-benar bodoh.
Vietnamese Translation
Anh ấy thật sự ngu ngốc.
Tagalog Translation
Talagang tanga siya.
