YOU SAID:

I think he is a brainless moron

INTO JAPANESE

私は彼が頭脳のないモロンだと思う

BACK INTO ENGLISH

I think he's a brainless Moron.

INTO JAPANESE

彼は頭が悪いモロンだと思う。

BACK INTO ENGLISH

I think he's a stupid Moron.

INTO JAPANESE

彼は愚かなモロンだと思う。

BACK INTO ENGLISH

I think he's a stupid Moron.