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English definition of “non compos mentis”

non compos mentis

adjective [after verb] uk   /ˌnɒnˌkɒm.pəsˈmen.tɪs/ us    /ˌnɑːnˌkɑːm.poʊsˈmen-/
describes someone who 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 Learners Dictionary & Thesaurus © Cambridge University Press)
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