Which term is defined as "gloomy; ill-tempered"?

The term "morose" accurately describes a state of gloominess and ill-temper. When someone is morose, they are often sullen or brooding, reflecting a disposition that is far from joyful or cheerful. This word conveys a sense of deep-seated sadness or a tendency to be dismal in mood.

In contrast, choices like "joyful," "cheerful," and "jubilant" all connote positive emotions and a happy demeanor. These terms represent states of happiness and exuberance, which are distinctly opposite to the qualities of being gloomy or ill-tempered. Such contrasting meanings highlight why "morose" is the only fitting choice for the definition provided.