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non compos mentis

c. 1600, in law, "not capable, mentally, of managing one's own affairs," Latin, "not master of one's mind," from non "not" + compos "having power" (from com- "together" + potis "powerful") + mentis "of the mind," genitive of mens "mind."

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Definitions of non compos mentis from WordNet

non compos mentis (adj.)
not of sound mind, memory, or understanding; in law, not competent to go to trial;
Synonyms: of unsound mind
From wordnet.princeton.edu

Dictionary entries near non compos mentis

nominee

nomology

nomothetic

-nomy

non-

non compos mentis

non sequitur

nona-

non-access

non-admission

nonage