大喜びで

with great joy

→ 大喜び
phrase Rare #33,277
with great joy Used to describe doing something with great delight or enthusiasm. In polite contexts, it can also mean “gladly” or “with great pleasure.”
JA: 彼女は大喜びでプレゼントを開けた。
EN: She opened the present with great joy.

彼は大喜びであなたを手伝ってくれるでしょう

He’ll be more than happy to help you.

大喜びでそういたします

I would be delighted to do so.

大喜びでわー

(Delightedly) Wow!

— かぐや姫の物語 (2013)

新しい本本当に大喜びで読ませていただきました

I was absolutely delighted to read your new book.

大喜びでやりました

I did it with great delight.