"Sur-passingly" is an adverb that means to a degree that exceeds expectations, and its antonyms reflect its opposite meanings. The first antonym is "unremarkably," which refers to something that is not extraordinary or outstanding, such as a piece of music that is average in quality. Another antonym is "inferiorly," which means something is of lower quality, lesser value, or not up to standard. Lastly, an antonym for "sur-passingly" is "mediocrely," which describes something as just average, neither particularly good nor bad. Hence, these antonyms of "sur-passingly" allude to something that is not exceptional, extraordinary, or surpassing expectations.