大だい得とく意い

na-adjective, noun which may take the genitive case particle 'no'

excellent; very good; exultant; elated

Describes something one is extremely proud of or very good at, or a state of great satisfaction and delight. Often used for a person's strong suit or a triumphant mood.

• 彼かれは数すう学がくが大だい得とく意いだ。

  He is excellent at math.

• 大だい得とく意いの笑え顔がおで賞しょう状じょうを受うけ取とった。

  With an exultant smile, she received the certificate.