numbskull

My brother is such a numbskull that he tried to boil water in the microwave.

用法提示：numbskull 作可数名词，表示‘傻瓜’，用在 such a ... that 结构中。

The teacher told the two numbskulls to stop talking during the exam.

用法提示：numbskull 的复数形式 numbskulls 指‘几个笨蛋’，作 told 的宾语。

I felt like a numbskull when I realized the answer was right in front of me.

用法提示：numbskull 作名词，用在 feel like a ... 中，表示‘像傻瓜一样’。