Final answer:
The adolescent claims to not enjoy swimming anymore, which is a description of anhedonia, a common symptom of Major Depressive Disorder.
Step-by-step explanation:
The adolescent client who quit the swim team because they no longer enjoy swimming is describing anhedonia, which is a symptom of Major Depressive Disorder (MDD). Anhedonia is the diminished ability to experience pleasure in activities that were once enjoyable.
This symptom is one of the key indicators used to diagnose major depression, along with other symptoms such as a depressed mood, changes in appetite and sleep, feelings of worthlessness, and difficulty concentrating, among others.