Same word as valiant:

adventurous, assertive, audacious, bold, chivalrous, courageous, dauntless, fearless, fire-eating, gallant, game, grand, great, gritty, gutsy, gutty, heroic, high-spirited, indomitable, intrepid, lion-hearted, magnanimous, nervy, noble, plucky, powerful, puissant, redoubtable, self-reliant, spunky, stalwart, steadfast, stout, stouthearted, strong-willed, unafraid, undaunted, undismayed, valorous, venturesome, venturous, vigorous, worthy