There are several synonyms for the phrase "nice going," which is often used to express approval or commendation for someone's achievements. Some alternatives to this phrase include "well done," "great job," "excellent work," "impressive performance," "outstanding effort," "bravo," "congratulations," "kudos," and "hats off." These expressions can be used in various settings, such as to praise a colleague for a successful project, to encourage a friend for completing a challenging task, or to congratulate a team for winning a competition. Using different words to express appreciation and recognition can add variety and enthusiasm to your language.