Synonyms and related words :
adamantine, athletic, beefy, bouncing, brawny, bulky, burly, dense, determined, doughty, durable, enduring, firm, firm as Gibraltar, flush, forceful, forcible, forcy, full-blooded, full-strength, gutsy, gutty, hale, hale and hearty, hard, hard as nails, hardy, hearty, heavy, hefty, husky, indomitable, infrangible, iron-hard, lasting, lusty, made of iron, massive, mighty, muscular, nervy, obstinate, potent, powerful, puissant, red-blooded, resolute, rigid, robust, robustious, robustuous, rude, rugged, solid, sound, stable, stalwart, staunch, steadfast, steady, steely, stout, strapping, strong, strong as brandy, strong as strong, strong-willed, substantial, tenacious, tough, unbreakable, uncompromising, unfaltering, unswerving, unwavering, unyielding, vigorous, vital, well-built, well-constructed, well-founded, well-grounded, well-made