mental illness

noun
any of the various forms of psychosis or severe neurosis.
Also called mental disorder, mental disease.


Origin:
1960–65

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
mental illness
 
n
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 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

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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American Heritage
Science Dictionary
mental illness   (měn'tl)  Pronunciation Key 
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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Example sentences
Paranoia and difficulties connecting with others are signs of psychosis, a
  mental illness in which people lose touch with reality.
Fame only made dealing with her mental illness that much more stressful and put
  her under more pressure.
Because faculty and staff regularly encounter students, they are in the best
  position to observe early symptoms of mental illness.
People who live in poverty are at increased risk of mental illness compared to
  their economically stable peers.
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