The word "more surpassing" implies an exceptional level of superiority. However, there are several antonyms that denote a lower or inferior quality, including "inferior," "subpar," "mediocre," "commonplace," and "average." These words imply a level of quality or superiority that is below what is expected, typical, or desired. Other related antonyms can include "below par," "inferior," "substandard," and "suboptimal." While these words may not necessarily carry the same level of negative connotations as some of their synonyms, they still denote a lack of excellence or a lesser quality. It is essential to choose the right antonym when trying to convey the opposite meaning of "more surpassing.