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compos mentis

compos mentis

3 9.9
A person who has full use of their mind and can make sensible decisions
  • adjective
  • /ˈkɒmpəs ˈmɛntɪs/
  • Jargon
translation icon : cognoscente
  • The court must determine if the defendant is compos mentis before a trial can proceed.
  • non compos mentis

Examples

  • He's virtually non compos mentis.

  • Yet, he took another draught of his beer, convinced that it was better to die non compos mentis.

    Fiction book (1996)
  • Although someone like Mr. Lockerby will present as completely non compos mentis...

  • Did you know that Dr. Fischer came to the conclusion that you were non compos mentis?

  • Non compos mentis... -

  • After the subway blowout and the line-up on top... they don't think she's 100% compos mentis.

  • As former Senator Birch Bayh, a key author of the Twenty-Fifth Amendment, has said, when a president is "going to be non compos mentis, somebody else should be running the shop."

    Academic text (2014)
  • He might not be altogether compos mentis—this hitchhiker, awarded to Bill by the journey, like an idiotic prize—but that made him all the more potentially dangerous.

    Fiction book (1998)
  • The lawyer argued that his client was compos mentis at the time of the incident.

  • To be considered compos mentis, an individual must clearly understand the consequences of their actions.

Synonyms

of sound mind
vscompos mentis
  • Formal
9 6.5

Able to think clearly and make decisions

is a Latin legal expression used in formal contexts
clear-thinking
vscompos mentis
3 4.2

Able to think calmly and logically without confusion or distraction

is about full legal mental capacity rather than simple logical thinking

Antonyms

insane
  • Slur
524 4.0

Having a very serious mental illness that changes how someone thinks

How Sane

compos mentis
  • Jargon
3 9.9
impaired
49 4.4
unsound
  • Formal
3 8.4
insane
  • Offensive
184 4.1

Surface Forms

compos mentis positive

Morphology

compos + mentis

This is a Latin legalism whose constituent elements are not English words and would not be recognizable to an average B1 learner; the input even shows no dictionary definitions for 'compos' and 'mentis'. Because the meaning ('of sound mind') relies on knowledge of Latin/legal jargon rather than transparent English composition, the sense cannot be derived from the parts and is therefore opaque.

Etymology

Compos mentis comes from Latin and literally means 'in control of the mind', with the parts compos meaning controlled and mentis meaning mind. So today compos mentis is used to say someone is 'of sound mind', able to think clearly and make legal decisions.