The word "un-liker" refers to someone who takes back their approval or liking of something or someone. Synonyms for "un-liker" include disapprover, detractor, pessimist, detractor, critic, adversary, antagonistic, and negative. A disapprover is a person who disagrees or disapproves of something, while a critic is someone who judges or evaluates something with a critical eye. An adversary is someone who opposes or goes against something, while a detractor is someone who belittles or diminishes the value of something or someone. Regardless of the synonym used, an "un-liker" brings a sense of negativity or disapproval.