non compos mentis Meaning, Definition & Usage

  1. adjective satellite not of sound mind, memory, or understanding; in law, not competent to go to trial
    of unsound mind.

WordNet

Non com"pos, Non com"pos men"tis (Also<
  • Non compos.
  • Non compos mentis
)
Etymology
L.
Definitions
  1. Not of sound mind; not having the regular use of reason; hence, also, as a noun, an idiot; a lunati one devoid of reason, either by nature or from accident.

Webster 1913