Synonyms and related words :
acid, beefy, biting, bold, bouncing, bulldoggish, corrosive, courageous, cutting, dauntless, doughty, driving, effective, forceful, forcible, forcy, full-blooded, full-strength, game, gamy, gritty, gutty, hale, hard, hard as nails, hardy, hearty, hefty, husky, imperative, impressive, incisive, intrepid, iron-hard, lusty, manful, manly, mettlesome, mighty, mordant, nervous, nervy, obstinate, penetrating, pertinacious, piercing, plucky, poignant, potent, powerful, puissant, punchy, red-blooded, resolute, robust, robustious, rugged, sensational, sinewed, sinewy, slashing, spirited, spiritful, spunky, stalwart, steely, stout, strapping, striking, strong, strong as brandy, strong as strong, strong-willed, sturdy, telling, tenacious, tough, trenchant, unfearful, valiant, vigorous, vital