The word "infirmnesses" refers to weaknesses or physical disability. Some antonyms for infirmnesses would be strength, robustness, fitness, and agility. These words describe physical qualities that are opposite to infirmities. They denote a state of being healthy and capable of performing tasks with ease. Other antonyms for infirmnesses could be mental fortitude, willpower, and determination. These words describe inner qualities that are opposite to a lack of self-confidence or determination. They denote a state of being mentally strong and resilient, able to overcome challenges and obstacles. Overall, antonyms for infirmnesses emphasize health, strength, and vitality.