The word supereminence refers to being superior or surpassing all others. The antonyms for the word supereminence could be mediocrity, inferiority, or average. Mediocrity refers to being average or ordinary, lacking distinction or excellence. Inferiority means being lower in rank, status, or quality compared to others. Average refers to being within the usual range or not exceptional. Other antonyms for supereminence could be subordination, lowliness, or commonness. These words signify a lack of superiority or distinction, and they are opposite in meaning to the word supereminence. Overall, the opposites of supereminence suggest a lack of exceptional or outstanding qualities.