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be compos mentis

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be compos mentis

Sane or mentally competent. The phrase is Latin for "of sound mind." I doubt that Travis was compos mentis when he committed that crime.

See also: compo

be compos mentis

  (humorous)

if someone is compos mentis, they are able to think clearly and are responsible for their actions My mother was quite old at the time but she was perfectly compos mentis.

See also: compo