na-adjective, noun
extremely delighted; most humbly pleased
A very formal, humble expression used to convey deep gratitude and delight, often in highly polite or ceremonial contexts. Typical of yojijukugo and kenjōgo.
ご招待いただき、恐悦至極に存じます。
I am most humbly delighted to receive your invitation.
このようなお心遣いを賜り、恐悦至極でございます。
I am extremely grateful and honored by your kind consideration.