Antipathetic relationships have received little empirical attention. This study examines these relationships by eliciting college students' descriptions of the formation, patterns of interpersonal behaviors, and termination of antipathetic relationships during high school. Factors that differentiate inimical from other antipathetic relationships are also investigated. The Interview of Friendship and Antipathetic Experiences, a semistructured retrospective interview of high school relationships, was administered to 80 college undergraduate students (69% female, M age = 19.1 years). Quantitative analyses, supplemented by illustrative quotes, indicate that antipathetic relationships, relative to friendships or interactions with neutral peers, were marked by conflict during formation and aggression and avoidance during the relationship. Inimical relationships were differentiated from other antipathetic relationships by greater conflict in their formation, open expression of dislike, and aggression. (Contains 2 tables and 1 note.)