(a.) Of or pertaining to temperament; constitutional.

affective arbitrary atavistic bluff bodily born brusque capricious changeable characteristic coeval congenital connatal connate connatural constitutional crabbed crabby cranky crotchety curt dispositional emotional erratic excitable explosive fanciful fantasied fantastic fickle flaky freakish genetic grouchy gruff grumpy harebrained hereditary high-strung hot-blooded hot-tempered hotheaded huffish huffy humorsome hypersensitive impatient in the blood inborn inbred incarnate inconsistent indigenous inherited innate instinctive instinctual intellectual irascible irritable kinky maggoty mental mercurial miffy moody motiveless native native to natural natural to notional organic oversensitive peevish petulant physical prickly primal quirky sensitive short short-tempered snappish spiritual testy tetchy thin-skinned ticklish touchy uncertain undependable uneven unpredictable unreasonable unreliable unrestrained unstable vagarious vagrant variable volatile wanton waspish wayward whimsical