The term "un-luckier" is a comparative form of the adjective "unlucky", which means not fortunate or unfortunate. The opposite or antonym of "un-luckier" is "luckier," which implies having good fortune or being fortunate. If someone is experiencing a fortunate circumstance, then they are considered lucky. Some other antonyms of "unlucky" include prosperous, successful, fortunate, and happy-go-lucky. It is important to understand the antonyms and synonyms of a word to use it appropriately in context. The language is full of such word pairs, and a better understanding of which words complement or oppose each other can enhance one's vocabulary and communication skills.