Definition of non compos mentis adjective from the Oxford Advanced American Dictionary

 

non compos mentis

 adjective
adjective
NAmE//ˌnɑn ˌkɑmpəs ˈmɛntəs//
 
(also non compos)(formal)
 
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not in a normal mental state opposite compos mentis
See the Oxford Advanced Learner's Dictionary entry: non compos mentis