The antonyms for the word "un-performed" are "completed," "achieved," "executed," "finished," "fulfilled," "realized," "accomplished," "fulfilled," "performed," "carried out," "concluded," and "implemented." These words denote the successful completion of a task or an activity. They convey a sense of accomplishment, achievement, and satisfaction, which is the exact opposite of "un-performed." In other words, they represent the positive outcomes of one's efforts, whereas "un-performed" denotes the failure to achieve the desired results. Therefore, to achieve success and realize our goals, it is essential to focus on the antonyms of "un-performed" and work diligently towards their accomplishments.