Antonyms for the word "hand strength" would be "weakness," "frailty," and "feebleness." These antonyms represent the opposite of physical strength and power. Weakness implies a lack of power or ability to exert force, while frailty suggests a state of vulnerability and susceptibility to injury or illness. Feebleness, on the other hand, emphasizes a lack of energy, vitality, and vigor. Antonyms for "hand strength" can be used to describe people who are physically or mentally weak or frail, or objects that are delicate, fragile, or easily broken. These terms can be useful in a variety of contexts, including sport, health, and everyday life.