The term 'un-likelier' itself speaks for it being the opposite of 'likelier'. A few antonyms to the word 'un-likelier' could be probable, promising, apt, fitting, or suitable. If we relate this term to the word 'unlikely,' it could mean that something is more probable to happen. In other words, the chances of something happening are high rather than low. The antonyms for 'un-likelier' can be used in various contexts, such as decision-making, events, situations, or circumstances. Using the appropriate antonym can help in expressing oneself more clearly and concisely.