# non compos mentis

> English word · Adjective

## Definitions
1. Insane; not of sound mind; not in control of oneself.

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

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-09-03.
Canonical page: https://plainspell.com/en/word/non-compos-mentis