The word un-lovelier is formed by adding the prefix "un" to the word "lovelier," which means less attractive or pleasing than before. Antonyms for un-lovelier would be words that describe something that is more beautiful or attractive. Some examples of antonyms for un-lovelier include "prettier," "more attractive," "more charming," "more appealing," "more graceful," and "more elegant." The usage of antonyms is important to express opposite meanings and helps to create a clear understanding of the given topic. In this case, using antonyms can help us to describe an object, person, or place that is more pleasant or charming than previously thought.