The salesman deceived customers into buying the product with false promises.

deceived 是动词 deceive 的过去式，deceive 的意思是"欺骗、蒙骗"，指通过虚假信息或误导性行为让别人相信不真实的事情。这个词由前缀 de-（表示"离开、偏离"）和拉丁词根 ceive（来自 capere，意思是"拿、取"）组成，字面意思是"通过欺骗手段获取"。