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Meaning of non compos mentis*

non com•pos men•tis

Pronunciation: (nōn' kōm'pōs men'tis Eng. non' kom'p&schwas men'tis), [key]
— Latin. Latin.
  1. not of sound mind; mentally incapable of managing one's affairs.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.