mental illnessmental illness
Any of various disorders characterized by impairment of an individual's thoughts, emotions, or social functioning, including schizophrenia and mood disorders such as bipolar disorder.
(countable and uncountable, plural mental illnesses)
- (uncountable) The property of being mentally ill; mental disorders taken as a whole.
- (countable) A mental disorder.
- The uncountable sense is far more common than the countable.