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non compos mentis

[nohn kohm-pohs men-tis; English non kom-puh s men-tis] /ˈnoʊn ˈkoʊm poʊs ˈmɛn tɪs; English ˈnɒn ˈkɒm pəs ˈmɛn tɪs/
Latin.
1.
not of sound mind; mentally incapable of managing one's affairs.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for non compos mentis

non compos mentis

/ˈnɒn ˈkɒmpəs ˈmɛntɪs/
adjective
1.
mentally incapable of managing one's own affairs; of unsound mind
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
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Word Origin and History for non compos mentis
non compos mentis
1607, from L., lit. "not master of one's mind."
Online Etymology Dictionary, © 2010 Douglas Harper
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non compos mentis in Medicine

non compos mentis non com·pos men·tis (nŏn kŏm'pəs měn'tĭs)
adj.
Not of sound mind and hence not legally responsible; mentally incompetent.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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non 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.”

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