The word sundered means to be separated or torn apart. Therefore, antonyms for the phrase most sundered would be words that describe unity, coherence, and harmony. Some possible antonyms for most sundered include united, joined, harmonious, integrated, and cohesive. These words suggest a state of togetherness, where there is no division or separation. For example, a united front against a common threat, a cohesive team working towards a shared goal, or an integrated society where people of all backgrounds come together as one. So, while the phrase most sundered may evoke images of discord and division, its antonyms convey a sense of cooperation and solidarity.