Use the adjective immoral to describe a person, group, or situation that intentionally goes against accepted ideas of what is right, like a government that attacks its own people, or a friend who steals your favorite spatula.
Morals are the principles we follow that help us know the difference between right and wrong. When someone is immoral, they make decisions that purposely violate a moral agreement. Immoral is sometimes confused with amoral, which describes someone who has no morals and doesn’t know what right or wrong means. Someone immoral, though, knows the difference and does bad stuff anyway, like that so-called friend who takes your utensils.