The phrase "firm hands" refers to hands that are strong, steady, and capable of delivering a firm grip. Synonyms for "firm hands" include sturdy hands, powerful hands, forceful hands, unyielding hands, resolute hands, and steady hands. Other possible synonyms include robust hands, muscular hands, sinewy hands, dependable hands, and unshaken hands. Each of these words conveys the idea of hands that are solid, reliable, and confident. Whether you're describing the hands of a construction worker, a weightlifter, or a surgeon, choosing the right synonym can help you create a vivid and compelling description of their skills and abilities.