n. a disturbed mental state in which attention cannot be sustained, the environment is misperceived, and the stream of thought is disordered.

in DSM–IV–TR, any one of a group of psychotic disorders with the essential feature of one or more nonbizarre delusions that persist for at least 1 month but are not due to schizophrenia. 

in DSM–IV–TR and DSM–5, a personality disorder manifested in a long-term pattern of passively allowing others to take responsibility for major areas of life and of subordinating personal needs to the needs of others, due to lack of self-confidence and self-dependence.

a dissociative disorder characterized by one or more episodes of depersonalization severe enough to impair social and occupational functioning.

in DSM–5, a new diagnosis in children 18 years or younger with persistent irritability and an average of at least three episodes per week of extreme behavioral dyscontrol (e.g., severe rages). It has been established as an alternative to the diagnosis of bipolar disorder in children.

in DSM–IV–TR, a mood disorder characterized by symptoms that are less severe but more enduring than those in major depressive disorder. It is identified as persistent depressive disorder in DSM–5. Also called dysthymia.