The antonyms for the word "more chicken-hearted" might include words such as brave, bold, courageous, fearless, gallant, hearty, heroic, intrepid, plucky, resolute, and strong-willed. These are all words that suggest courage in the face of danger or adversity, and they can be used to describe people who are willing to take risks and stand up for what they believe in. While some may view being chicken-hearted as a negative trait, there are many positive qualities that can be associated with bravery and fortitude, and it is important to recognize and embrace these qualities in ourselves and others.