1. (superl.) Subject to varying moods, especially to states of mind which are unamiable or depressed.

2. (superl.) Hence: Out of humor; peevish; angry; fretful; also, abstracted and pensive; sad; gloomy; melancholy.

abrupt adrift afloat alternating amorphous arbitrary beetle-browed black black-browed blue brooding broody cantankerous capricious changeable changeful chapfallen cheerless crabbed crabby cranky crestfallen crotchety crusty curt dark dejected depressed desolate despondent desultory deviable disconsolate disheartened dismal dizzy dour downcast downhearted dumpish eccentric erratic fanciful fantasied fantastic fast and loose fickle fitful flaky flickering flighty flitting fluctuating freakish frowning giddy gloomy glowering glum grim grum harebrained huffish huffy humorsome ill-humored ill-tempered impatient impetuous impulsive in the doldrums inconsistent inconstant indecisive infirm irregular irresolute irresponsible irritable kinky long-faced lowering lugubrious maggoty mazy melancholy mercurial moodish mopey moping mopish morose motiveless mumpish notional out of sorts peevish petulant piqued quirky rambling restless roving sad saturnine scatterbrained scowling shapeless shifting shifty short short-tempered shuffling snappish snappy spasmodic spineless sulking sulky sullen surly temperamental testy touchy unaccountable uncertain uncontrolled undependable undisciplined uneven unfixed unhappy unpredictable unreasonable unreliable unrestrained unsettled unstable unstable as water unstaid unsteadfast unsteady vacillating vagarious vagrant variable vicissitudinary vicissitudinous volatile wandering wanton waspish wavering wavery wavy wayward whimsical wishy-washy