When searching for antonyms for the phrase "sub par," one may look for words that carry a positive connotation. Some suitable antonyms for sub par may include words like excellent, outstanding, exceptional, remarkable, superb, superior, flawless, exceptional, and phenomenal. These words signify a level of quality that is superior to the term "sub par," which implies mediocrity or below-average quality. By using these antonyms, one can effectively communicate a high level of quality, which can be used to describe anything from a product or service to an experience or accomplishment. In contrast, using sub par antonyms can help elevate the esteem of something that is otherwise considered mediocre.