be compos mentis
(redirected from compos mentis)Also found in: Dictionary, Thesaurus, Medical, Legal, Wikipedia.
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.
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.
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?Farlex Partner Idioms Dictionary © Farlex 2017