stalwart

Synonyms: athletic bold bound bound and determined brave brawny brick-wall courageous daring dauntless dead set on dependable fearless forceful gutsy hanging tough hefty husky indomitable intrepid lusty muscular nervy powerhouse redoubtable robust rugged sinewy solid spunky staunch steamroller stout stouthearted strapping sturdy substantial tenacious tough unafraid undaunted valorous vigorous

Antonyms: cowardly meek weak