Definition: Antithetical. Defined as opposing or in opposition to something, usually through a contradiction or difference. Definition: "The meaning of antithesis is to give contrast; to present the extremes of an argument in such a way that they are not alike, but are at the same time incompatible with each other." Example: A. Antithetical to all. B. A great and terrible thing. C. Antithetical to the sun. D. The antithesis of justice. In verse, it could be used to show contrast between two ideas that are in opposition.