Is compos mentis - Idioms by The Free Dictionary
be compos mentis (redirected from is compos mentis)
be compos mentis
To be sane or mentally competent. "Compos mentis" is Latin for "of sound mind." I doubt that Travis was compos mentis when he committed that crime.
be ˌcompos ˈmentis (from Latin, formal or humorous) having full control of your mind: Are you sure she was fully compos mentis when she said that?
References in periodicals archive
My aunty is 91, my mother is 89 and my aunt still walks every day and is compos mentis
and my family is Polish so I come from good old Polish stock.