acerb, acerbate, acerbic, acid, acidic, acidulent, acidulous, acrimonious, ambivert, angry, bilious, bitter, burning, captious, carping, caustic, cranky, cycloid, cyclothyme, cyclothymic, dyspeptic, ectomorph, embittered, endomorph, extrovert, faultfinding, fiery, heated, hot-tempered, indignant, introvert, irate, ireful, jaundiced, mad, melancholic, mesomorph, phlegmatic, quick-tempered, rancorous, rankled, ratty, resentful, resenting, sanguine, schizoid, schizothyme, sore, sour, sour-tempered, soured, splenetic, spunky, stewing, syntone, testy, tetchy, touchy, vinegarish, virulent, waxy, wrathful, wrathy, wroth