The term "most unmanful" suggests a lack of courage, integrity, or strength. Antonyms for this phrase would be "most manful," implying strength, courage, and bravery. Other antonyms could include "courageous," "gallant," "heroic," "intrepid," "valiant," "fearless," "undaunted," "bold," "brave," and "daring." These antonyms all convey a sense of strength, courage, and honor, which are qualities that are the opposite of "most unmanful." Using these antonyms can help to add a positive and powerful tone to any piece of writing or conversation. It is always better to encourage positive values and to strive for bravery, honor, and heroism.