<unk> , a concept used in the field of medical psychology, is defined as the joint tendency towards negative affectivity (e.g. worry, irritability, gloom) and social inhibition (e.g. reticence and a lack of self-assurance). The letter D stands for "distressed".
Type D personality
Cluster B personality disorders
Dependent personality disorder
Haltlose personality disorder
Histrionic personality disorder
Organic personality disorder
Sadistic personality disorder
Obsessive–compulsive spectrum