(uncountable, psychiatry) The property of being mentally ill; mental disorders taken as a whole. / (countable, psychiatry) A mental disorder.

plural of mental illness

plural of mental age

(psychology) Repression of painful thoughts. / (psychology) Inability to continue a train of thought.

How old one appears to be based solely on mental ability and function.

plural of mental institution

(derogatory slang) A psychiatric hospital, or the psychiatric ward of a hospital.

Having both physical and mental aspects; involving both the body and the mind; psychosomatic.

One's emotional well-being, especially with reference to one's outlook on life, ability to cope with stress or the absence of a mental disorder.

A nervous breakdown.