The antonyms for the word "most declined" would be words that indicate growth, progress, or improvement. Some possible antonyms could be "flourishing," "thriving," "expanding," "booming," or "prospering." These words imply that something is advancing and growing, rather than decreasing or declining. Other antonyms for "most declined" could include "rising," "developing," "blossoming," "vibrant," or "blooming." These are all positive and optimistic terms that suggest improvement and success, rather than the negative connotations of "most declined." It's important to choose the appropriate antonym based on the context and intended meaning of the original phrase.