Gallantness can be defined as bravery, chivalry, or honor. Antonyms for this word would be cowardice, traitorous behavior, and dishonor. Cowardice is the opposite of gallantness, as it suggests a lack of bravery or a willingness to retreat from difficult situations. Traitorous behavior implies disloyalty and a lack of honor, which is the opposite of gallantness. Dishonor is another antonym, as it suggests disgrace or shame, which is the opposite of gallant behavior. These words are important to understand, as they provide us with a deeper appreciation of what it means to act gallantly, and how such behavior can have a positive impact on our lives and the lives of those around us.