1. A mood disorder characterized by mild depression.
2. A type of depression involving long-term, chronic symptoms that do not disable a person, but which keeps one from functioning fully or from feeling at one's best.
3. Dysthymia is less severe than depression and what is considered a major depression; however, people with dysthymia may experience major depressive episodes.
4. Depression, usually of less severity than psychotic depression or a major depressive disorder.