n.冒充内行者；骗子

That charlatan is anything but a doctor. 那江湖骗子决不是医生。

He was sure that he was dealing with a charlatan. 他真以为自己遇上了江湖骗子。

In spite of his boasts of having cured many people, he was nevertheless shown up as a charlatan. 尽管那人夸口说他治好了许多人的病，但他还是被揭穿为一个江湖骗子。