The phrase "most readying" means the most prepared or the most to be prepared. The antonyms for this phrase depend on the context in which it is used. For instance, if it is describing a person who is not prepared, then some antonyms could be unready, unprepared, or ill-prepared. In the context of a situation, some antonyms could be chaotic, disorderly, or messy. Alternatively, if the word choice is related to something not ready, then antonyms could be unfinished, incomplete, or unresolved. Understanding the context of the phrase can help identify the appropriate antonyms to use.