irritable (adj.)
- aggressive
- allergic
- anaphylactic
- apprehensive
- bad-tempered
- bearish
- bellicose
- belligerent
- bitchy
- cantankerous
- choleric
- churlish
- combative
- crabbed
- crabby
- cranky
- cross
- cross-grained
- crotchety
- crusty
- cussed
- delicate
- disagreeable
- disputatious
- divisive
- dyspeptic
- edgy
- emotional
- empathetic
- empathic
- eristic
- eruptive
- excitable
- explosive
- factious
- fearful
- feisty
- fractious
- fretful
- frightened
- goosy
- grouchy
- gruff
- high-spirited
- high-strung
- huffish
- huffy
- hypersensitive
- ill-humored
- ill-tempered
- impatient
- inflammable
- irascible
- itchy
- litigious
- mean
- mettlesome
- moody
- nervous
- nervy
- ornery
- overrefined
- oversensitive
- overstrung
- panicky
- partisan
- peevish
- perturbable
- perverse
- pettish
- petulant
- polemic
- prickly
- pugnacious
- quarrelsome
- querulous
- raspy
- refined
- responsive
- sensitive
- short-tempered
- shrewish
- skittish
- snappish
- snappy
- spiteful
- splenetic
- supersensitive
- sympathetic
- tactful
- temperamental
- tender
- testy
- tetchy
- thin-skinned
- ticklish
- touchy
- ugly
- uneasy
- volcanic
- waspish
- whiny