The word "superordinary" is not used frequently in the English language, and therefore, there are no commonly established antonyms for it. However, to identify antonyms for this word, we can break it down into its parts i.e., "super" and "ordinary." Super means exceptional, supreme, or outstanding, while ordinary means regular, average, or normal. Therefore, the antonyms for superordinary can be termed as regular, average, or normal. Some alternate antonyms that can be used for the word superordinary are ordinary, average, mundane, commonplace, or mediocre. These words can be used to describe things that are not exceptional or outstanding.