Synonyms and related words :
beefy, bouncing, bulldoggish, doughty, dynamic, energetic, forceful, forcible, forcy, full-blooded, full-strength, game, gamy, gritty, gutsy, gutty, hale, hard, hard as nails, hardy, hearty, hefty, husky, iron-hard, lusty, mettlesome, mighty, nervy, obstinate, pertinacious, plucky, potent, powerful, puissant, resolute, robust, robustious, rugged, spirited, spiritful, spunky, stalwart, steely, stout, strapping, strenuous, strong, strong as brandy, strong as strong, strong-willed, sturdy, tenacious, tough, vigorous, vital