Undesirable means not wanted or unpleasant. Its antonym is desirable, which means something that is wanted or pleasing. Desirable can be used to describe things that are attractive, appealing or beneficial. Other antonyms for undesirable include favorable, welcome, agreeable, lovely, desirable, and enjoyable. The word desirable is often used in the context of relationships or jobs, where a person or a position can be described as desirable if they are desirable to have. Using antonyms helps to clarify meaning and to create more precise language. Knowing the opposites of words can also be helpful when trying to express oneself more precisely.