The word "most unsympathizing" refers to someone who lacks empathy and compassion towards others. The antonyms for this phrase are those who are caring, understanding, and kind-hearted. Some of the antonyms for "most unsympathizing" are sympathetic, compassionate, empathetic, kind, caring, considerate, responsive, understanding, and warm-hearted. These people often put themselves in the shoes of others and try to help them out in any way possible. They are always ready to lend an ear and provide moral support. So, if you come across someone who is "most unsympathizing", you can be assured that there are many compassionate and kind people out there who will support you whenever needed.