na-adjective
Describes a person's appearance, expression, or manner as showing pride or triumph, often visibly. Can be positive (justifiable pride) or negative (smugness).
彼は賞状を受け取ると、誇らしげに微笑んだ。
When he received the certificate, he smiled proudly.
子供たちは自分たちの作品を誇らしげに見せてくれた。
The children proudly showed us their creations.