noun, na-adjective
highly delighted; deeply satisfied; brimming with satisfaction
A somewhat literary or emphatic expression for being completely satisfied or overjoyed. Often used in formal or written contexts.
彼は満悦至極の表情で賞状を受け取った。
He received the certificate with a look of deep satisfaction.
お客様が満悦至極のご様子で、私どもも嬉しく存じます。
We are also pleased that our customer seems highly delighted.
A yojijukugo (four-character compound) combining 満悦 (great delight) and 至極 (utmost, extreme). The exact historical derivation is uncertain, but it follows a common pattern of intensifying a feeling with 至極.