Undesirable is an adjective used to describe something that is not wanted or considered unfavorable. Its antonyms are words that express the opposite meaning. Some of the antonyms of undesirable are desirable, wanted, attractive, pleasing, and agreeable. Desirable describes something that is a source of pleasure and worth having. Wanted refers to something that is requested, needed, or desired. Attractive means something that has the ability to draw attention and pleases the senses. Pleasing refers to something that provides satisfaction and creates a sense of contentment. Lastly, agreeable means something that is pleasant, conducive, and easy to deal with. These antonyms can be used to describe things that are desirable, needed, pleasant, or appreciated.