bad temper

• irritableEasily provoked to annoyance
• grumpyIrritable in temperament
• crankyIll-tempered and peevish
• moodyProne to sullenness
• snappyQuick and clever

sullen · sour · cross · petulant · foul · tantrum · outburst · storming · slamming · huffing · scowling · glaring · snapping · growling · bristling · seething · volatile · explosive

• grumpinessgrumpiness, crankiness, moodiness, sullenness, grouchiness
• anger expressionssee red, seeing red, lose your temper, blow a fuse, blow a gasket
• turn-offsick, red flag, red flags, dealbreaker, dealbreakers
• flawsfaults, defect, flaw, blemish, flaws
• combativenessaggression, antagonism, belligerence, bellicosity, combativeness
• crueltycruelty, brutality, inhumanity, viciousness, ruthlessness