Condemnation is the act of declaring something awful or evil. If your little brother does something unspeakably awful, express your condemnation so he will learn not to do it again.
Condemnation comes from the verb condemn, "to strongly disapprove." You might criticize something that you still think is worthwhile, but if you express condemnation, that’s laying a heavy moral blame. Condemnation is used in law, and means the same thing as sentencing; you might have heard a judge say “I condemn you to ten years of hard labor.” Also, a very dangerous building will be sealed up and deemed uninhabitable by an act of condemnation.