Mis-spent is a term used to describe time, money or other resources that have been wasted on something useless or unproductive. Its antonyms are "well-spent," "prudently-used," "meaningful," "effective," "fruitful," and "beneficial." These antonyms reflect the opposite of mis-spent time or resources which instead bring about satisfactory results or progress. When someone uses their time or money efficiently or effectively, the results are productive and provide personal satisfaction, while a mis-spent resource only brings regret and negativity. Therefore, it's important to strive for well-spent resources to ensure that each moment is optimized to its fullest potential.