The antonyms for the word "most chickenhearted" are brave, courageous, fearless, bold, daring, gallant, heroic, and valiant. These words imply fearlessness, boldness, and willingness to take risks. When someone is brave, they do not hesitate to confront danger or take on challenges, even if it means putting their life at risk. Courageous people have a strong moral or ethical character and are willing to face difficult situations with confidence and determination. Fearlessness and boldness suggest a willingness to take risks and leap into the unknown. Gallant, heroic, and valiant are all more elevated terms, implying selflessness and nobility of character in the face of adversity.