Most staying implies longevity and staying power. However, its antonyms denote the opposite, meaning temporary and fleeting. Words like ephemeral, short-lived, transient, and impermanent all convey the idea of something that does not last long. Fleeting moments that come and go in the blink of an eye. On the other hand, terms like fickle, capricious, and unstable explain a person or thing that is inconsistent and cannot be relied upon. They are constantly changing, and their behavior is unpredictable, leading to a lack of steadfastness. Therefore, the antonyms for the phrase most staying illustrate the opposite of something enduring and long-lasting.