Infirm

Antonyms of INFIRM

red-blooded, strengthened, fit, energetic, robust, invigorated, hard, athletic, hale, hardened, strong, rugged, lusty, beefy, Vitalized, stalwart, brawny, virile, able-bodied, recovering, muscular, toughened, fortified, capable, healthy, mighty, hardy, firm, hearty, powerful, sound, stout, competent, strapping, inured, resolute, sinewy, husky, tough.