A vile, wicked person who is extremely depraved, capable or guilty of great crimes, and a deliberate scoundrel.

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. Compare: hero (“the current player”).

Archaic form of villein (“feudal tenant, peasant, serf”).