Am compos mentis - Idioms by The Free Dictionary
be compos mentis (redirected from am 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?