Definition of non compos mentis adjective from the Oxford Advanced Learner's Dictionary

 

non compos mentis

 adjective
adjective
BrE
 
; NAmE
 
(also non compos)(formal) Mental and emotional problems
 
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not in a normal mental state opposite compos mentis See related entries: Mental and emotional problems Word OriginLatin, literally ‘not having control of one's mind’.
See the Oxford Advanced American Dictionary entry: non compos mentis