高级词汇026 antagonist

antagonist /ænˈtægənɪst/

n. a person with determined opposition or hatred toward someone

n. 敌手，反对者，反面人物

The antagonist of a novel is usually a source of agony for the hero, who is known as the protagonist.
小说里的反派通常是让英雄（也就是主角）头疼的家伙。