|temp(ə)rə|ment ə l, -pər|- adjective
1. : of, relating to, or arising from temperament : constitutional
temperamental peculiarities
temperamental indifference to neatness and order — G.W.Johnson
2.
a. : marked by excessive sensitivity and sudden impulsive and often explosive changes of mood : high-strung , excitable
a temperamental opera singer
temperamental , argumentative and full of rowdy spirits — Stanley Walker
b. : marked by erratic, unpredictable behavior : capricious , fickle
this parasite … proved to be a most temperamental performer; sometimes it would and sometimes it would not — C.C.Furnas
that beautiful, but temperamental instrument, the flute — Osbert Lancaster