credulous

1. ADJ If you describe someone as credulous, you have a low opinion of them because they are too ready to believe what people tell them and are easily deceived. 轻信的[表不满]

...quack doctors charming money out of the pockets of credulous health-hungry citizens. ...从那些渴望健康而又容易上当受骗的市民那里骗钱的江湖郎中。