The antonyms for the term "most unsporting" can be "fair", "sportsmanlike", "honorable", "ethical", "respectful", "just", "upright", "righteous", "noble", and "virtuous". These words describe the qualities and attributes of a true sportsman who believes in fair play and honest competition. These are the individuals who respect their opponents and never indulge in any unfair tactics or unsportsmanlike behavior to gain an edge over them. Being ethical and upright in sports helps to foster an environment of healthy competition where everyone has an equal chance to showcase their skills, talent and abilities. Therefore, it is important to cultivate these traits to excel in sports while maintaining integrity and sportsmanship.