villain
A vile, wicked person.
An extremely depraved person, or one capable or guilty of great crimes.
A deliberate scoundrel.
(derogatory) A low-born, abject person.
In fiction, a character who has the role of being bad, especially antagonizing the hero; an antagonist who is also evil or malevolent.
(poker) Any opponent player, especially a hypothetical player for example and didactic purposes.
(archaic) Feudal tenant, peasant, serf.
(obsolete) To debase; to degrade.