Exuberate, meaning to express lively and enthusiastic enjoyment or energy, has some antonyms that suggest a more somber tone. These include sulk, mope, brood and languish. A person who sulks displays a silent and angry demeanor that is the opposite of the high energy and exuberance of someone who exuberates. Similarly, a person who mopes is someone who is feeling down or sorry for themselves, which is again the opposite of exuberance. Brooding involves being deep in thought about a problem or situation, which can manifest as a moodiness or melancholy that is not associated with exuberance. Finally, languishing means to suffer in a state of stagnation or neglect, which is also at odds with the concept of exuberance.