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non compos mentis

[nohn kohm-pohs men-tis; English non kom-puh s men-tis]
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adjective Latin.
  1. not of sound mind; mentally incapable of managing one's affairs.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for compos mentis

non compos mentis

adjective
  1. mentally incapable of managing one's own affairs; of unsound mind
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Word Origin

Latin: not in control of one's mind
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

Word Origin and History for compos mentis

non compos mentis

Latin, literally "not master of one's mind."

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Online Etymology Dictionary, © 2010 Douglas Harper

compos mentis in Medicine

non compos mentis

(nŏn kŏm′pəs mĕntĭs)
adj.
  1. Not of sound mind and hence not legally responsible; mentally incompetent.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

compos mentis in Culture

non compos mentis

[(non kom-puhs men-tis)]

A phrase used to describe someone who is out of his or her mind and therefore not legally responsible for his or her actions: “It was determined by the court that the killer was non compos mentis.” From Latin, meaning “not having control of the mind.”

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The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.