quick-tempered

easily upset, angered

Synonyms: choleric, cranky, cross, excitable, fiery, hot-tempered, impatient, impulsive, inflammable, irascible, irritable, passionate, peppery, petulant, quarrelsome, ratty, sensitive, short-tempered, shrewish, splenetic, temperamental, testy, waspish

Antonyms: calm, cool, easy-going, even-tempered, laid-back