in one's right mind

Prepositional phrase

idiomatic

(idiomatic) Thinking clearly, sensibly, and reasonably.

Japanese Meaning

正気で、冷静かつ合理的に物事を考えられる状態 / 常識的に判断できる状態 / 賢明で、理にかなった思考が行われている状態

正気であれば、誰が会社の実績を確認せずに貯金全額を投資するだろうか。

Sense（1）

(idiomatic) Thinking clearly, sensibly, and reasonably.

“Is Mike Hartley in his right mind, do you think, sir?” inquired Sweeting simply.

“Can't tell, Davy. He may be crazed, or he may be only crafty.”