Synonyms and related words :
adventuresome, adventurous, audacious, bold, brash, careless, cheeky, daredevil, daring, death-defying, devil-may-care, enterprising, fire-eating, forward, gutsy, harebrained, hasty, headlong, heedless, hotheaded, impetuous, imprudent, incautious, irresponsible, madbrain, madbrained, madcap, nervy, overbold, precipitate, presumptuous, rash, reckless, temerarious, thoughtless, unthinking, venturesome, venturous, wild, wild-ass