Etymology

non compos mentis

Today it means: Insane; not of sound mind; not in control of oneself. Full definition →

Latin non
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The story

  1. Latin · borrowed fromnon“not”
  2. English todaynon compos mentis

From Latin non (“not”) + compos (“in control, having mastery”) + mentis (“of mind”).

Words from the same roots

Latinnon all →

n/anon serviam

Etymology from Wiktionary, CC BY-SA 4.0.