society > morality > moral evil > moral or spiritual degeneration > degrading or impairing morally > [adjective] (26)
That corrupts or undermines the morals or moral principles of a person, group, etc. Now somewhat archaic (chiefly U.S.).
That tends to lower or demoralize a person.
figurative. Morally or spiritually unhealthy; having a deleterious effect on society.