simpleton

Don't be such a simpleton; you need to think before you act.

用法提示：名词，指一个人缺乏智慧或常识，用于指责或提醒。

Only a simpleton would believe that obvious lie.

用法提示：名词，指一个易受骗或判断力差的人。

The con artists targeted simpletons who didn't understand the scam.

用法提示：名词复数形式，指一类容易被欺骗的人。