To call down evil on someone or something. To curse God or holy things or persons is a form of blasphemy. To curse rational creatures is a grave offense against justice and charity. To curse irrational creatures, such as the weather or animals, is normally a venial sin of impatience. to curse the evil spirit as the enemy of God and human beings is lawful. but exclamations that in themselves are not sinful may become unlawful for other reasons, such as the danger of scandal.