Stoutheartedness is defined as having a brave and courageous spirit, but there are several antonyms that describe the opposite qualities. Cowardice is the most obvious opposite of stoutheartedness, referring to a lack of bravery or self-confidence. Timidity also shares a similar meaning, describing shyness or hesitancy in the face of danger. Weakness is another antonym, implying a lack of physical, mental, or emotional strength. Conversely, recklessness or foolhardiness could be seen as extreme or misguided forms of courage, indicating a disregard for safety or reason. Ultimately, stoutheartedness and its antonyms represent different levels of confidence, resilience, and daring in the face of adversity.