The term "more chicken hearted" suggests a lack of courage or bravery. Antonyms of this phrase could include "fearless," "bold," "courageous," "valiant," or "gallant." These words all embody a sense of strength, bravery, and fearlessness in the face of danger or challenge. Someone who is "fearless" may have no fear at all, while someone who is "bold" may take risks and act with confidence. Similarly, someone who is "courageous" or "valiant" may act selflessly in the face of danger, while someone who is "gallant" may exhibit chivalrous behavior. Whatever word is used, it represents the opposite of being "more chicken hearted.