What are the opposite words for memberless?

The word "memberless" is defined as having no members or being without members. Some antonyms for this word could include "populated," "filled," or "attended." These words all suggest a sense of abundance, where there is a presence of people or things. Another antonym could be "occupied," which implies that a space or organization has been taken up by someone or something. "Join" could also be an antonym for "memberless," as it suggests a desire or willingness to become a part of something. Overall, antonyms for "memberless" focus on the presence of individuals or things in a space or organization.