Definition of non compos mentis in English:

non compos mentis

Line breaks: non com¦pos men¦tis
Pronunciation: /ˌnɒn ˌkɒmpɒs ˈmɛntɪs
 
/
(also non compos)

adjective

  • Not sane or in one’s right mind.
    More example sentences
    • There is nothing you can do without her consent - unless you were to challenge her mental capacity and prevail - so you have to respect her decision; either that or you must have her declared non compos.
    • He's had them ever since you were declared non compos.
    • Look, you are not the arbiter of what is or is not ‘pro-American’, you are just another rightist flamer who is non compos mentos.

Origin

Latin, literally 'not having control of one's mind'.

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