しら

I wonder

particle Rare #36,290
I wonder A sentence-final particle expressing uncertainty or wondering; often associated with feminine speech.
JA: 明日は晴れるかしら。
EN: I wonder if it will be sunny tomorrow.

子供はいつもなにかしらいたずらをしている

Children are always up to some kind of mischief.

あの人達何してるしら

I wonder what those people are doing.

— 暗殺の森 (1971)

何も見えやしないどこかしら

I can't see a thing. Where could it be?

— アメリ (2001)

誰にしたらいいかしら

Who should I choose?