The word "proudly" is correct and usable in written English.
You can use it when you want to express that someone did something in an admirably confident or assertive manner. For example: He proudly declared that he had succeeded in his mission.
In the entrance to the Abba Museum in Stockholm on Tuesday, the owner of the first ticket to Sweden's newest tourist attraction proudly displays his prize.
More than that, he proudly declares he is challenging world leaders to get off the fence and approve his plans.
There is something both proudly old-fashioned and fiercely modern about any farmer who flies in the face of mass food production.
The difference is that there are boxes of cereal lined up proudly on the counter.
Around the corner from Tony Wilson's In The City offices (proudly and defiantly based in Salford), Sounds From The Other City began in 2005 with the aim of re-inventing the urban music festival.
On the eve of the final match of the season, Barcelona proudly announced that Leo Messi had signed a new deal at the Camp Nou.
The country's geopolitical strategic standing as both a hub offering easy links to east and west and a proudly Muslim country in which numerous nationalities and religions happily coexist suggests that the latest cooling technologies and a close to nonexistent crime rate are far from the only reasons why it should win the 2022 vote in Zurich on 2 December.
The Cabinet Office proudly announced last year that What Works was a world first: "it's the first time any government has taken a national approach to prioritising the use of evidence in decision-making".
Kalamma smiles proudly as she speaks of her son's friendships: "They come to visit Ramish every day, and if by chance they don't come one day, he goes straight over to the shop to call them".
He exploded onto the literary scene with Trainspotting in 1993, and has been proudly in our faces ever since.
I would have happily taken part and proudly defended our strong @LibDems record in government," he tweeted.
