foolhardy (adj.)

• adventuresome
• adventurous
• audacious
• bold
• brash
• careless
• cheeky
• daredevil
• daring
• devil-may-care
• enterprising
• forward
• gutsy
• harebrained
• hasty
• headlong
• heedless
• hotheaded
• impetuous
• imprudent
• incautious
• irresponsible
• madcap
• nervy
• overbold
• precipitate
• presumptuous
• rash
• reckless
• temerarious
• thoughtless
• unthinking
• venturesome
• venturous
• wild