See testy in Webster's New World Roget's A-Z Thesaurus II
adjective
Easily annoyed:
choleric, irascible, peppery, quick-tempered, tetchy, touchy. See feelingsHaving or showing a bad temper:
bad-tempered, cantankerous, crabbed, cranky, cross, disagreeable, fretful, grouchy, grumpy, ill-tempered, irascible, irritable, nasty, peevish, petulant, querulous, snappish, snappy, surly, ugly, waspish. (Informal) crabby, mean2. Idiom: out of sorts. See attitude
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