The phrase "are in same league" refers to two or more entities that are comparable in terms of quality, ability, or achievement. Antonyms of this phrase include "aren't in the same league," "outclass," "outperform," and "outmatch," which imply a significant difference in quality or ability between two entities. Other antonyms could include "inferior," "subpar," "substandard," "unmatched," "unequal," and "incompetent," which suggest a lack of similarity or compatibility in terms of quality or ability. It is essential to consider antonyms of "are in the same league" when providing feedback or evaluation, as they provide a more nuanced and objective perspective on performance or quality.