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mental illness

any of the various forms of psychosis or severe neurosis.
Also called mental disorder, mental disease.
Origin of mental illness
First recorded in 1960-65 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for mental disease
Historical Examples
  • The sexual passion has often been compared to drunkenness or to mental disease.

    The Sexual Question August Forel
  • What applies to physical disease is just as applicable to mental disease.

    The Necessity of Atheism Dr. D.M. Brooks
  • Hyperboreans have a mental disease which renders them liable to suggestion.


    William Graham Sumner
  • Prison doctors have no knowledge of mental disease of any kind.

  • Grard died a violent death, but he was afflicted with mental disease.

    Vie de Bohme Orlo Williams
  • Sadness and pessimism are the worst forms of mental disease I know.

    The Angel of Pain E. F. Benson
  • “A mental disease known only to the Government of Meccania,” he answered.

    Meccania Owen Gregory
  • The mental disease of the madman causes his eye to see that which is not.

  • He has signs of mental disease which cannot now be confused with drink.

  • His letters are free from the slightest sign of mental disease.

    Michael Faraday

    Walter Jerrold
British Dictionary definitions for mental disease

mental illness

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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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mental disease in Medicine

mental disease n.
See mental illness.

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.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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mental disease in Science
mental illness
Any of various psychiatric disorders or diseases, usually characterized by impairment of thought, mood, or behavior.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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