(a.) Daring without judgment; foolishly adventurous and bold.

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