だろう
1
seems;I think;I guess;I wonder;I hope
conjectural form of copula だ
See also:
でしょう
無実だという彼の主張は誰も信じないだろう。
Nobody will believe his assertion that he is innocent.
2
right?;don't you agree?;I thought you'd say that!
「くれるの？」「いやあ、ホテルで呑むんですよ」「だろうね」
"Can I have it?" "Sorry, I drank it at the hotel!" "Thought so."