temperamental
/ˌtemprəˈmentl/📚 19223 55考研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. 喜怒无常的
adjective [原级]喜怒无常的，性情多变的；气质的，性情的；（机器、汽车等）性能不稳定的，易坏的
He is very temperamental and critical.
他喜怒无常，而且吹毛求疵。
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