だろうか

expression

I wonder; don't you think?; indicates question

Expresses a rhetorical or self-addressed question, often with a nuance of wondering or doubt. Can also be used to seek agreement or confirmation from the listener.

• 彼かれは本ほん当とうに来くるだろうか。

  I wonder if he'll really come.

• この計けい画かくはうまくいくだろうか。