subject to changing and unpredictable emotional states; moody, capricious; sometimes used figuratively to describe user-unfriendly or unstable machines or software that are either complicated and/or have poorly written instructions and are subsequently difficult to operate
If you describe something such as a machine or car as temperamental, you mean that it often does not work properly. I first started cruising in yachts with temperamental petrol engines
likely to perform unpredictably; "erratic winds are the bane of a sailor"; "a temperamental motor; sometimes it would start and sometimes it wouldn't"; "that beautiful but temperamental instrument the flute"- Osbert Lancaster
relating to or caused by temperament; "temperamental indifference to neatness"; "temperamental peculiarities"
relating to or caused by temperament; "temperamental indifference to neatness"; "temperamental peculiarities
disapproval If you say that someone is temperamental, you are criticizing them for not being calm or quiet by nature, but having moods that change often and suddenly. He is very temperamental and critical