malade mental

Noun

 * 1)  madman, fool
 * 2)  mentally ill person

Usage notes
Having been widely used to insult, the term is nowadays considered offensive and is usually replaced by other terms or periphrases to convey the sense of ‘mentally ill person’: e.g., , , etc.

Adjective

 * 1)  crazy, sick 1
 * 2)  mentally ill