ill-natured
quick-tempered
short-tempered
bad-tempered
choleric
disobedient
excitable
headstrong
hot-blooded
impetuous
irascible
opinionated
overbear
petulant
pugnacious
quarrelsome
self-conceited
self-indulgent
strong-willed
testy
thin-skinned
warm-hearted
willful
cool
cool-headed
even-tempered