Irritable

a.	1.
	1.	Capable of being irritated.
	2.	Very susceptible of anger or passion; easily inflamed or exasperated; as, an irritable temper. Vicious, old, and irritable. - Tennyson.
	3.	(Physiol.) Endowed with irritability; susceptible of irritation; capable of being excited to action by the application of certain stimuli.
	4.	(Med.) Susceptible of irritation; unduly sensitive to irritants or stimuli. See Irritation, n., 3.

Adj.	1.	irritable - easily irritated or annoyed; "an incorrigibly fractious young man"; "not the least nettlesome of his countrymen" Synonyms: peevish, pettish, petulant, techy, testy, tetchy, cranky, fractious, nettlesome, peckish
	2.	irritable - abnormally sensitive to a stimulus
	3.	irritable - capable of responding to stimuli Synonyms: excitable

aggressive, agitable, all nerves, allergic, anaphylactic, apprehensive, bad-tempered, bearish, bellicose, belligerent, bickering, bitchy, cankered, cantankerous, churlish, combative, crabbed, crabby, cranky, cross, cross-grained, crotchety, crusty, cussed, delicate, disagreeable, disputatious, divisive, dyspeptic, edgy, emotional, emotionally unstable, empathetic, empathic, eristic, eruptive, explosive, factional, factious, fearful, feisty, fractious, fretful, frightened, goosy, grouchy, gruff, high-mettled, high-spirited, high-strung, highly emotional, huffish, huffy, hyperesthetic, hyperpathic, hypersensitive, ill-humored, ill-tempered, impatient, inflammable, itchy, litigious, mean, mettlesome, moody, nerves on edge, nervous, nervy, on edge, ornery, overrefined, oversensible, oversensitive, overstrung, overtender, panicky, partisan, passible, perturbable, perverse, pettish, petulant, pindling, polarizing, polemic, prickly, pugnacious, quarrelsome, querulous, raspy, refined, responsive, sensitive, short-tempered, shrewish, skittish, snappy, spiteful, spleeny, splenetic, startlish, supersensitive, sympathetic, tactful, temperamental, tender, tetchy, thin-skinned, ticklish, touchy, ugly, uneasy, volcanic, waspish, whiny, wrangling