What mental health condition is characterized by an inability to enjoy usual activities?

The condition that is characterized by an inability to enjoy usual activities is depression. This mental health disorder significantly affects a person's mood and overall ability to engage in what they typically find pleasurable or fulfilling. Individuals with depression often experience a profound sense of sadness and a loss of interest in activities they once enjoyed, which is known as anhedonia.

In contrast to anxiety, which primarily involves excessive worry and fear, depression specifically impairs one's ability to feel pleasure. Bipolar disorder includes episodes of both depression and mania, while PTSD involves reliving traumatic experiences and heightened arousal, neither of which solely focus on the inability to enjoy usual activities. Therefore, depression is the most relevant condition in this context.