What is the meaning of Temperamental?

Of, related to, or caused by temperament.

Subject to changing and unpredictable emotional states; moody, capricious.

User-unfriendly, unstable, that is complicated or has poorly written instructions and is subsequently difficult to operate; unpredictable and erratic.

temperamental (regarding temperament)

temperamental (who has untimely and intense reactions)

temperamental, moody

temperamental, moody

Source: wiktionary.org