The word "un-happier" refers to a state of being less happy than before. The antonyms, on the other hand, represent words that have an opposite meaning to the original word. Therefore, the antonyms for "un-happier" are "happier," "jollier," "cheerful," "blissful," "elated," "contented" and "pleasurable." These words portray a state of happiness, joy and contentment. They are essential for expressing positivity and optimism in our day-to-day lives. Understanding that there are always antonyms available to every given word creates an opportunity to broaden our vocabulary and communicate more effectively.