Wiktionary
unfavorite
(context informal English) Not preferred; particularly meaning “''especially'' disliked”. n. (context informal English) Something that is not a favorite; particularly something that is “''especially'' disliked”. v
(context Internet English) To remove from one’s list of favorites.
Usage examples of "unfavorite".
He drove the limousine to the church the day she married Hal Oliphant, the unfaithful, drunken unfavorite son of some big family in the East.