Meaning of “non compos mentis” in the English Dictionary

british dictionary

"non compos mentis" in British English

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non compos mentisadjective [ after verb ]

uk /ˌnɒn ˌkɒm.pəs ˈmen.tɪs/ us /ˌnɑːn ˌkɑːm.poʊs ˈmen.tɪs/

Someone who is non compos mentis is unable to think clearly, especially because of mental illness, and therefore not responsible for their actions.

(Definition of “non compos mentis” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)