UNFAVORITE
Etymology
Adjective
unfavorite (comparative more unfavorite, superlative most unfavorite)
(informal) Not preferred; in particular, especially disliked.
Noun
unfavorite (plural unfavorites)
(informal) Something that is not a favourite; particularly something that is especially disliked.
Usage notes
Most often used in explicit contrast to favorite, as in “These are some of my favorite and unfavorite things”.
Verb
unfavorite (third-person singular simple present unfavorites, present participle unfavoriting, simple past and past participle unfavorited)
(Internet) To remove from one’s list of favorites.
Usage notes
Most often used in reference to Twitter, as in “How do I unfavorite a tweet?”
Antonyms
• (all senses): favorite
Source: Wiktionary