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Thesaurus: non compos mentis

Not of sound mind; not having the regular use of reason; hence, also, as a noun, an idiot; a lunatic; one devoid of reason, either by nature or from accident.

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  1. Not of sound mind; not having the regular use of reason; hence, also, as a noun, an idiot; a lunatic; one devoid of reason, either by nature or from accident.
  2. adj. not of sound mind, memory, or understanding; in law, not competent to go to trial
  3. Not of sound mind; not having the regular use of reason; hence, also, as a noun, an idiot; a lunati NONCON. Non"con. (, n. See Noncontent.
  4. Not of sound mind; not having the regular use of reason; hence, also, as a noun, an idiot; a lunatic; one devoid of reason, either by nature or from accident.