Dictionary.com
definitions
  • synonyms

mental illness

See more synonyms for mental illness on Thesaurus.com
noun
  1. any of the various forms of psychosis or severe neurosis.
Show More

Origin of mental illness

First recorded in 1960–65
Also called mental disorder, mental disease.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018


British Dictionary definitions for mental disease

mental illness

noun
  1. 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
Show More
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

mental disease in Medicine

mental disease

n.
  1. mental illness
Show More

mental illness

n.
  1. Any of various psychiatric conditions, usually characterized by impairment of an individual's normal cognitive, emotional, or behavioral functioning, and caused by physiological or psychosocial factors.mental disease mental disorder
Show More
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

mental disease in Science

mental illness

[mĕntl]
  1. Any of various psychiatric disorders or diseases, usually characterized by impairment of thought, mood, or behavior.
Show More
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.