unfavorite

adj

1. (informal)Not preferred; in particular, especially disliked.

   “I'm going to talk about business, which is really my most unfavorite aspect of doing this work. We are involved in an enormous contradiction: we're trying to make a living in a system where no one makes a living doing creative stuff.”

noun

1. (informal)Something that is not a favourite; particularly something that is especially disliked.

verb

1. (Internet, transitive)To remove from one’s list of favorites.

   “How do I unfavorite an online bookmark?”