The nemesis of the PROTAGONIST. Usually the villain in a story. In the Harry Potter books it is Lord Voldemort.
The antagonist in literature is the main enemy to the protagonist, the main character/hero of the book.
People in conflict with each other are antagonists. The conflict may be violent or nonviolent.
An antagonist is a person who is opposed to, struggles against, or competes with another; opponent; adversary.Also it is used as a register in the theatre arts to describe a or the character who is...