The word "most unexclusive" refers to something that is not limited to a few individuals or groups but is open to all. The antonyms for this phrase would be "exclusive" or "restrictive," implying that access to something is limited or controlled. Other antonyms could include "elite," "privileged," or "selective," which suggest that only certain individuals, groups, or classes can access something. Meanwhile, the words "partial," "biased," or "unfair" could also be considered antonyms, indicating that some groups or individuals are favored over others. Ultimately, the antonyms for "most unexclusive" all refer to situations where access or privilege is limited or constrained in some way.