non compos mentis

Adjective

not-comparable

(law, but also seeing wider use) Insane; not of sound mind; not in control of oneself.

Japanese Meaning

正気でなく、精神異常である状態 / 理性を欠いて、自己制御ができない状態

The court declared him non compos mentis, and he was placed under guardianship.

裁判所は彼を心神喪失と認定し、後見人の管理下に置きました。

Sense（1）

(law, but also seeing wider use) Insane; not of sound mind; not in control of oneself.