What best defines a morose individual?

A morose individual is best defined as someone who exhibits a gloomy and ill-tempered demeanor. This term conveys a sense of deep sadness and a tendency to be sullen, which can manifest in a person's attitudes and interactions with others. Such an individual often appears withdrawn and may have a pessimistic outlook on life, contributing to a general atmosphere of negativity around them.

In contrast, other options describe traits that are quite opposite. A cheerful and lively person exudes positivity and energy, while someone who is calm and relaxed would typically be free from stress or agitation, presenting a positive and peaceful presence. Lastly, a curious and engaging individual is characterized by an eagerness to learn and interact, demonstrating enthusiasm and a sociable temperament, which stands in stark contrast to the somberness associated with being morose.