我想知道 美國正統 幼稚鬼的英文

“幼稚”的英文是"childish"，外國人不會說什麼鬼之類的，他們一般形容“別這麼幼稚”。

Don't be so childish!
Stop being childish!



或者他們會用"baby"一詞來形容像個小孩似的長不大，也就意指幼稚的意思。

Don't be such a baby!
Stop acting like a baby!



如果你堅持要“幼稚鬼”word by word的翻譯，那我只能想到 "childish person".

You are such a childish person.

Brat is what you wanted. It is used on annoying, spoiled, irritating kids. Of course, mostly boys. However, military brats are not that negative.

I think, American don't like "ghost" that much, so in their language, they don't add "ghost". 幼稚鬼 is close to immature, childish, or naive, but no ghost.