A morose person is sullen, gloomy, sad, glum, and depressed — not a happy camper.
When someone is morose, they seem to have a cloud of sadness hanging over them. This word is a stronger than just sad — morose implies being extremely gloomy and depressed. We all can be morose at times, like after the death of a friend or family member. Some people tend to be morose more often: being morose is just part of some personalities. Whenever you see the word morose, think "really, really sad and gloomy."