having or exhibiting a strongly marked, individual temperament.

moody, irritable, or sensitive

a temperamental artist.

given to erratic behavior; unpredictable.

of or pertaining to temperament; constitutional

temperamental differences.

adjective

easygoing , happy , laid-back , peaceful , pleased

adjective

capricious , changeable , cussed , easily upset , emotional , erratic , excitable , explosive , fickle , fiery , froward , headstrong , high-strung * , hotheaded * , hyper , hypersensitive , impatient , in bad mood , inconsistent , irritable , mean , mercurial , neurotic , ornery , passionate , petulant , sensitive , thin-skinned * , ticklish , touchy , uncertain , undependable , unpredictable , unreliable , unstable , variable , volatile , willful , fantastic , fantastical , freakish , inconstant , unsteady , whimsical , moody