compulsive, curmudgeon, cynic, dispassionate, disposition, equable, equanimity, extrovert, feisty, fickle, finicky, forbearing, grave, grumpy, gutless, halfhearted, impassive, inclined, inflexible, insouciant, introvert, inveterate, mercurial, negative, obdurate, obsessive, phlegmatic, predispose, proclivity, prone, propensity, quarrelsome, querulous, reserved, reticent, retiring, stoic, stolid, sullen, surly, taciturn, temper, temperament, temperamental, tetchy