If a person experiences a loss of interest in usual activities and at least four other depressive symptoms chronically for at least two weeks, and these symptoms are severe enough to interfere with the person's ability to function in everyday life, the person meets the criteria for

Persistent depressives disorder (dysthymia)

Explanation:

Persistent depressive disorder, also called dysthymia is a continuous long-term (chronic) form of depression. It makes one lose interest in normal daily activities, feel hopeless, lack productivity, and have low self-esteem and an overall feeling of inadequacy, incapable of having fun, glooming personality. These feelings last for years and may significantly interfere with one's relationships, school, work and daily activities.