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any of the various forms of psychosis or severe neurosis.
any of various disorders in which a person’s thoughts, emotions, or behaviour are so abnormal as to cause suffering to himself, herself, or other people

mental illness n.
Any of various disorders characterized chiefly by abnormal behavior or an inability to function socially, including diseases of the mind and personality and certain diseases of the brain. Also called mental disease, mental disorder.
mental illness
Any of various psychiatric disorders or diseases, usually characterized by impairment of thought, mood, or behavior.


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  • Mental impairment

    noun 1. (law) (in England, according to the Mental Health Act 1983) a state of arrested or incomplete development of mind, which includes significant impairment of intelligence and social functioning and is associated with abnormally aggressive or seriously irresponsible conduct

  • Mentalism

    [men-tl-iz-uh m] /ˈmɛn tlˌɪz əm/ noun 1. the doctrine that objects of knowledge have no existence except in the mind of the perceiver. 2. the doctrine that human conduct reflects the operation of a nonmaterial principle. 3. any psychological theory that accepts as a proper subject of study the basis for human behavior. /ˈmɛntəˌlɪzəm/ noun […]

  • Mentalist

    [men-tl-ist] /ˈmɛn tl ɪst/ noun 1. a person who believes in or advocates mentalism. 2. a person who believes that the mind and its functions are a legitimate area of psychological research. 3. a mind reader, psychic, or fortuneteller. n. 1782, from mental + -ist. Originally in reference to artistic taste; philosophical sense (from mentalism) […]

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