The website's discount offer looks attractive, but it's actually a deceptive marketing tactic.

deceptive 是形容词，由动词 deceive（欺骗）加上形容词后缀 -tive 构成。deceive 来自拉丁语 decipere，意为"欺骗、误导"。deceptive 表示"具有欺骗性的、误导性的"，形容表面看起来很好但实际上会误导人的事物。