Chicken-hearted is an adjective used to describe someone who is cowardly or fearful. Its antonyms, on the other hand, would be words that describe the opposite traits. One antonym for chicken-hearted could be brave or courageous. Another antonym could be bold or daring. Words like fearless, confident, and valiant could also be considered antonyms for chicken-hearted. These words describe people who are willing to take risks and face their fears head-on. By contrast, chicken-hearted people tend to shy away from challenges and avoid situations that make them uncomfortable. Therefore, it's important to cultivate bravery and confidence in oneself in order to overcome a chicken-hearted mentality.