How to describe a person who secretly harms herself but pretends to be a good person, so that everyone thinks that she is very kind to you, but in fact she is specially designed to make you stumble an

How to describe a person who secretly harms herself but pretends to be a good person, so that everyone thinks that she is very kind to you, but in fact she is specially designed to make you stumble and hurt you? How can such a person be described as a scumbag? The former set is good for you, and the latter set is good for you. Those who stab you in the back are all insidious or insidious little people. If you know what kind of person he is, stay away from him. You can't make friends with such people. Besides, you can't offend her, as long as you can get by on the whole, there is no need to elaborate, because. You are a villain, so you should stay away. There is no need to dispute with such people.