The antonyms for the word "more weak-kneed" are strong, courageous, brave and resolute. These words describe individuals who possess the ability to face challenges and adversity head-on with unwavering determination. They are not easily shaken by fear, uncertainty or doubt and are willing to take risks to achieve their goals. Such individuals often have a strong sense of purpose, high levels of self-confidence, and an unwavering belief in themselves. They also possess the necessary skills and knowledge to handle difficult situations and make tough decisions. Being strong and courageous is a quality admired by many, and it can help you achieve great feats in life.