The term "most supermundane" refers to things that are beyond the earthly or mundane realm. The antonyms for this term would be words that describe things that are ordinary or commonplace. Some antonyms for "most supermundane" could be "mundane," "earthly," "normal," "ordinary," "typical," "conventional," "average," "standard," or "routine." These words describe things that are typical or commonplace on Earth and do not possess any exceptional or extraordinary qualities. They are the opposite of the term "most supermundane," which describes something that is exceptional and beyond the normal scope of experience.