choleric
eager
fiery
hasty
hot-tempered
hotheaded
impetuous
irascible
quick-tempered
rash
reckless
short-tempered
vehement
violent
adventurous
brash
credulous
excitable
flighty
good-hearted
headstrong
high-spirited
hot-blooded
impressionable
imprudent
insubordinate
mercurial
nice-looking
thoughtless
unruly
warm-hearted
weak-minded