Non compos

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Non com´pos

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.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
For adults of sound mind to confess to be 'non compos mentis' (not sane or in one's right mind) is remarkable.
She was able to demonstrate that the uses and meanings of words such as idiota and non compos mentis ebbed and flowed at different times.
True enough, the rival factions are now said to be fighting over the ashes of the dearly departed, a weird echo of the tug-of-war they played over the custody of their aged and non compos mentis father just before his death in 2001, and quite possibly, a prelude to renewed fighting on the legal front over her estate, on top of the pending tussle over other Ilusorio assets.