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