easily irritated or annoyed; readily excited to impatience or anger.

Physiology, Biology . displaying irritability.

Pathology . susceptible to physical irritation.

Medicine/Medical . abnormally sensitive to a stimulus.

adjective

cheerful , happy , nice

adjective

annoyed , bearish , brooding , cantankerous , carping , choleric , complaining , contentious , crabbed , cross , crotchety , disputatious , dissatisfied , dyspeptic , easily offended , exasperated , fiery , fractious , fretful , fretting , gloomy , grouchy , grumbling , hasty , hot , huffy , hypercritical , ill-humored , irascible , moody , morose , out of humor , oversensitive , peevish , petulant , plaintive , prickly , querulous , quick-tempered , resentful , sensitive , snappy , snarling , surly , tense , testy , touchy , bad-tempered , cranky , disagreeable , grumpy , nasty , snappish , ugly , waspish , atrabilious , bilious , captious , crabby , edgy , excitable , impatient , ornery , spleeny , splenetic , tetchy