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喜ぶだろう

will probably be happy

→ 喜ぶ
phrase Rare #37,720
will probably be happy 喜ぶ means “to be happy” or “to be pleased,” and だろう expresses likelihood or conjecture.
JA: 彼はその知らせを聞いて喜ぶだろう。
EN: He’ll probably be happy to hear the news.

きっと喜ぶだろう

They’ll surely be happy.

— フィールド・オブ・ドリームス (1989)

もし万が一彼女が日本に来るとすれば、ジェーンはとても喜ぶだろう。

If by any chance she were to come to Japan, Jane would be delighted.

あなたにお目にかかると彼は喜ぶだろうと思います。

I think he would be pleased to meet you.

プレゼントをあげれば、彼はもっと喜ぶだろうか。

Would he be happier if I gave him a present?

あなたが自分で会いに行けば彼女は喜ぶだろう。

She would be happy if you went to see her yourself.