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- Dictionarynon com·pos men·tis/ˌnän ˌkämpəs ˈmen(t)əs/
adjective
- 1. not sane or in one's right mind.
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adjective
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Latin legal phrase meaning "of unsound mind"
Non compos mentis is a Latin legal phrase that translates to "of unsound mind": nōn ("not") prefaces compos mentis, meaning "having control of one's mind." This phrase was first used in thirteenth-century English law to describe people afflicted by madness, the loss of memory or ability to reason. Wikipedia