audacious, bold, brave, committed, courageous, daring, dauntless, fearless, gutsy, indefatigable, intrepid, lionhearted, mettlesome, plucky, resolute, self-confident, stalwart, stout-hearted, unafraid, undeterred, unfazed, unflinching, unscared, unshaken, unshrinking, unwavering, valiant
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