ill-natured
abrupt
bad-tempered
choleric
churlish
excitable
hot-blooded
hot-headed
hot-tempered
ill-tempered
impatient
impulsive
irascible
irritable
quarrelsome
short
short-tempered
snappish
splenetic
temperamental
testy
touchy
volatile
waspish
captious
contentious
contumacious
crossgrained
crotchety
foolhardy
fretful
headstrong
high-spirited
ill-tongued
peppery
pugnacious
unaccommodating
cool
cool-headed
even-tempered