stubborn, disagreeable, nasty, bloody-minded, attitude, waspish, querulous, crotchety, sanguinary, ill-tempered, ugly, ill-natured, critical, bloodthirsty, ornery, snappy, out of sorts, testy, bad-tempered, quarrelsome
difficult (part of speech: adjective)
fussy, thorny, demanding, cumbersome, strenuous, arduous, laborious, difficult, knotty, rough, uphill, ticklish, tricky, formidable, harsh, grinding, troublesome, finicky, wearing, tough, stressful, wearying, contrary, complicated, complex, tight, severe, burdensome, wearisome, hard, adverse, toilsome, onerous, rugged, oppressive, trying, bothersome
sullen (part of speech: adjective)
glowering, obstinate, fretful, crabby, mean, beetle-browed, glum, morose, scowling, grim, moping, sullen, hostile, grouchy, melancholy, dejected, grumpy, long-faced, unsociable, sulky, broody, gloomy, cynical, malevolent, noncooperative, unfriendly, dour, dark, ungenial, uncooperative, frowning, moody, dissociable
irritable (part of speech: adjective)
bitchy, touchy, acerbic, bearish, spiteful, cross, irascible, caustic, prickly, crabbed, snappish, bellicose, crusty, bitter, acid, irritable, huffy, petty, petulant, sour, peevish, churlish, surly, acrimonious, cranky, tart
- She should not; he would turn cantankerous. - "Tales of the Five Towns", Arnold Bennett.
- Aye, he's cantankerous, I'll grant you, but he's quick. - "Caribbee", Thomas Hoover.
- I'm going to stop it all out now, and I shan't go- and what's more, mamma, he cried, nursing one of his little patent leather shoes as he lolled back, if you are cantankerous, hang me if I don't contrive that the governor has the full run of the wine at the wedding breakfast, there. - "Lady Maude's Mania", George Manville Fenn.