A sentence-ending particle (mainly feminine) expressing wonder or uncertainty — similar to "I wonder" or "do you think?"
明日は雨が降るかしら？
I wonder if it will rain tomorrow.
これで大丈夫かしらん。
I wonder if this will be okay.
彼、本当に来るかしら。
I wonder if he'll really come.
Indicates vagueness or imprecision — used in expressions like "something/somehow/somewhere" (e.g., "何かしら").
何かしらいい方法があるかしら。
I wonder if there's some good method.
いつかしら彼に会える日が来るかしらん。
I wonder if a day will come when I can meet him.