immoral — violating moral principles; not conforming to the patterns of conduct usually accepted or established as consistent with principles of personal and social ethics.
bad — If you say that it is bad that something happens, you mean it is unacceptable, unfortunate, or wrong.
corrupt — Someone who is corrupt behaves in a way that is morally wrong, especially by doing dishonest or illegal things in return for money or power.
deceptive — If something is deceptive, it encourages you to believe something which is not true.
devious — If you describe someone as devious you do not like them because you think they are dishonest and like to keep things secret, often in a complicated way.
dishonourable — showing lack of honor or integrity; ignoble; base; disgraceful; shameful: Cheating is dishonorable.