bold
adventuresome
adventurous
audacious
brash
careless
cheeky
daredevil
daring
death-defying
devil-may-care
enterprising
fire-eating
foolish
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
foolhardier
foolhardiest
chimerical
chivalrous
dare-devil
fruitless
hazardous
headstrong
ill-advised
ill-conceived
ill-considered
impracticable
indiscreet
insubordinate
laughable
perverse
quick-tempered
self-willed
suicidal
wrongheaded