compos mentis
- adjective
- /ˈkɒmpəs ˈmɛntɪs/
- Jargon
- The court must determine if the defendant is compos mentis before a trial can proceed.
- non compos mentis
Examples
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He's virtually non compos mentis.
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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...
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Did you know that Dr. Fischer came to the conclusion that you were non compos mentis?
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Non compos mentis... -
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After the subway blowout and the line-up on top... they don't think she's 100% compos mentis.
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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.
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To be considered compos mentis, an individual must clearly understand the consequences of their actions.
Synonyms
Able to think clearly and make decisions
Able to think calmly and logically without confusion or distraction
Antonyms
How Sane
Surface Forms
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.