Non Compos Mentis Definition

nŏn kŏmpəs mĕntĭs

adjective

Not of sound mind and hence not legally competent.

American Heritage Medicine

Mentally incompetent.

Webster's New World Law

(law, but also seeing wider use) Insane; not of sound mind; not in control of one's self.

Wiktionary

Synonyms:

noun

One who is not legally competent.

American Heritage Medicine

Not of sound mind; mentally incapable of handling one's own affairs.

Webster's New World

Origin of Non Compos Mentis

Latin nōn compos mentis nōn not compos in control mentis genitive sing. of mēns mind

From American Heritage Dictionary of the English Language, 5th Edition
Latin

From Wiktionary

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