The antonyms for the word "most obverse" form a broad range of expressions, depending on the context in which the term is used. The word "obverse" generally refers to the front or the visible side of an object, and the antonyms reflect the opposite meaning. Some of the antonyms may include terms such as "rear, back, bottom, interior, or hidden," depending on the object or the idea that is being discussed. Other antonyms could be "unseen, secret, obscure, hidden, or obscure," indicating that what is implied or intended is not immediately apparent. Choosing the appropriate antonym requires understanding of the context and the nuances of language.