temperamental

Relating to or caused by temperament.

Excessively sensitive or irritable; moody.

Likely to perform unpredictably; undependable.

Of or pertaining to temperament.

Of or pertaining to temperament; constitutional.

of, related to, or caused by temperament

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.

relating to or caused by temperament

likely to perform unpredictably

subject to sharply varying moods