temperamental (adj.)

• affective
• arbitrary
• atavistic
• bluff
• bodily
• born
• brusque
• capricious
• changeable
• characteristic
• coeval
• congenital
• connate
• connatural
• constitutional
• crabbed
• crabby
• cranky
• crotchety
• curt
• emotional
• erratic
• excitable
• explosive
• fanciful
• fantastic
• fickle
• flaky
• freakish
• genetic
• grouchy
• gruff
• grumpy
• harebrained
• hereditary
• high-strung
• hot-blooded
• hot-tempered
• hotheaded
• huffish
• huffy
• hypersensitive
• impatient
• inborn
• inbred
• incarnate
• inconsistent
• indigenous
• inherited
• innate
• instinctive
• intellectual
• irascible
• irritable
• kinky
• maggoty
• mental
• mercurial
• moody
• motiveless
• native
• natural
• 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
• vagrant
• variable
• volatile
• wanton
• waspish
• wayward
• whimsical