Dastardness, which refers to cowardice or lack of courage, has several antonyms, including fearlessness, bravery, courage, heroism, and gallantry. Fearlessness denotes being unafraid and bold even in the face of danger or adversity, while bravery implies displaying strength and composure in challenging situations. Courage, on the other hand, connotes the moral or inner strength to do what is right, regardless of the risks involved. Heroism refers to exceptional bravery or selflessness in the pursuit of a noble cause or to help others. Finally, gallantry implies chivalrous behavior or acts of bravery and honor towards others, particularly women.