The antonyms for the word "most weak-kneed" are strong, determined, resolute, steadfast, courageous, and unwavering. Each of these words describes a person who is confident and able to face challenges without hesitation. Strong individuals are not easily intimidated, while determined individuals are persistent in achieving their goals. Resolute individuals are firm in their decisions, while steadfast individuals don't waver in their beliefs. Courageous individuals exhibit bravery and fearlessness in the face of danger, while unwavering individuals are steadfast, resolute, and determined. In contrast to weak-kneed, these antonyms represent individuals who are capable, firm, and decisive, making them capable of overcoming any challenge that comes their way.