out of one's mind

Adjective

idiomatic

(idiomatic) Insane, crazy. / (idiomatic) Temporarily mentally unstable; very distressed.

Japanese Meaning

(慣用句) 正気を失うほどおかしい、狂っている / (慣用句) 一時的に精神的に不安定で、非常に動揺している

An out of one's mind decision to climb the frozen cliff without gear put everyone at risk.

装備もなく凍った崖を登るという正気の沙汰ではない決断が、皆を危険にさらした。

Sense（1）

(idiomatic) Insane, crazy.

You're out of your mind if you think you can jump that far.

Sense（2）

(idiomatic) Temporarily mentally unstable; very distressed.

When you didn't phone home, we were out of our minds with worry.