Antagonist Definition What is an antagonist ? Here’s a quick and simple definition: An antagonist is usually a character who opposes the protagonist (or main character) of a story, but the antagonist can also be a group of characters, institution, or force against which the protagonist must contend. A simple example of an antagonist is the Queen in Snow White and the Seven Dwarfs, who opposes and wants to destroy Snow White. Some additional key details about antagonists: Not all stories ... Learn the meaning of antagonist as a person, a muscle or a chemical substance that opposes or reduces something else. Find examples of antagonist in sentences and translations in different languages. Definition of antagonist noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. On the stage or screen, in a story or a novel, the protagonist is the main character and the antagonist is the opposing one . Pro- and ant- usually mark the good and bad characters, but not always; there may occasionally be an evil protagonist and a good antagonist.