The word "more unaccepted" means something that is not widely acknowledged or approved of. Its antonyms, or words with opposite meanings, include accepted, approved, endorsed, recognized, endorsed, and vouched for. Something that is accepted is widely acknowledged, believed, or recognized by a majority. Similarly, if something is approved, it is generally considered appropriate or good. Endorsed and vouched for both suggest trust and confidence. Therefore, the antonyms of "more unaccepted" all suggest something that is not only acknowledged widely but also trustworthy and appropriate.