be compos mentis

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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.
See also: compo, mentis
Farlex Dictionary of Idioms. © 2015 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?
See also: compo, mentis
Farlex Partner Idioms Dictionary © Farlex 2017
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