The term "most seconded" refers to something that has been supported or endorsed by the largest number of people. Antonyms for this phrase would include "unpopular," "unsupported," "disapproved," "opposed," or "ignored." If something is "unpopular," it means that it lacks the widespread support that "most seconded" would imply. If something is "unsupported" or "ignored," it suggests that it has not been backed by anyone or overlooked. "Disapproval" or "opposition" implies that people actively reject or resist the idea, whereas "most seconded" suggests the opposite. In sum, antonyms for "most seconded" indicate a lack of support, approval, or agreement.