plural of mutism

A psychological disorder in which the sufferer cannot speak in certain situations.

(clinical psychology, psychiatry) A severe form of social anxiety disorder characterized by a total inability to speak or communicate orally in certain social settings. The inability to speak is involuntary and persistent, and is not caused by a communication disorder, neurodevelopmental disorder, psychotic disorder, or intellectual disability.

(clinical psychology, psychiatry) Dated form of selective mutism (“A severe anxiety disorder characterized by a total inability to speak in some social settings”). In the past, some clinicians erroneously believed that individuals with elective mutism chose to remain silent in some social situations as an act of defiance. Contrary to what was once believed, the inability to speak (mutism) is involuntary, thus the potentially misleading term elective mutism has largely been supplanted by selective mutism.