Disappointment is the feeling of dissatisfaction that follows the failure of expectations or hopes to manifest. Similar to regret, it differs in that a person feeling regret focuses primarily on the personal choices that contributed to a poor outcome, while a person feeling disappointment focuses on the outcome itself. It is a source of psychological stress. The study of disappointment—its causes, impact, and the degree to which individual decisions are motivated by a desire to avoid it—is a focus in the field of decision analysis, as disappointment is, along with regret, one of two primary emotions involved in decision-making.
Disappoint is traced to the Middle English disappointen by way of the Old French desapointer. In literal meaning, it is to remove from office. Its use in the sense of general frustration traces to the late 15th century, and it first appears recorded in English as an emotional state of dejection in the middle 18th century.
Disappointment is a subjective response related to anticipated rewards. The psychological results of disappointment vary greatly among individuals; while some recover quickly, others mire in frustration or blame or become depressed.
A 2003 study of young children with parental background of childhood onset depression found that there may be a genetic predisposition to slow recovery following disappointment. While not every person responds to disappointment by becoming depressed, depression can (in the self psychology school of psychoanalytic theory) almost always be seen as secondary to disappointment/frustration.