気は確か

of sound mind

→ 気
phrase Rare #40,680
of sound mind Used to ask or state whether someone is thinking normally, often expressing concern or disbelief. Commonly appears as 気は確かか or 気は確かだ.
JA: そんな危険なことをするなんて、気は確かなの?
EN: Are you in your right mind, doing something that dangerous?

酔ってるかもしれないが気は確か

I may be drunk, but I know what I'm doing.

気は確かかい

Are you in your right mind?

あなたたち二人とも気は確かなの

Are you two out of your minds?

気は確かなのか

Are you in your right mind?

— インディ・ジョーンズ/最後の聖戦 (1989)