The phrase "a very assured" is correct and usable in written English.
It can be used to describe someone who is confident or self-assured in a particular situation or context.
Example: "She walked into the meeting with a very assured demeanor, ready to present her ideas."
Alternatives: "a highly confident" or "a very self-assured".
His whiplash quietness in that film, his icy politeness, and the lethal competitiveness made him seem like a veteran in the midst of a very assured cast.
But there is a very assured Bottom from Oliver Chris who has all the bumptious geniality of the star amateur actor.
As several early readers have noted, this is a very assured first novel, and it's packed with cleverly sarcastic wit, between drives on the parkway and the turnpike.
But "Ordinary People," based on a novel by Judith Guest and adapted for the screen in a tensely understated script by Alvin Sargent, was immediately recognized by critics and audiences as the work of a very assured, thoughtful and ambitious filmmaker.
He was also a very assured operator in diverse styles: he could do documentary and surrealism; he could take an ordinary story out of the newspapers, see its historical resonance, and then recast the journalistic mode as something like Brechtian theater.
"Fabian Spiess was excellent, he put in a very assured performance.
The former party girl has a DBE, and a relaxed but very assured graciousness to match.
"'After considering the text as a whole, we find that the lyrics are not acceptable within our churches.' I know this might sound strange, but in a way it made me feel very assured.
United win their third away match in a row, and open their Champions League campaign with a win and a performance that started out solid but ended up very assured.
An imposing physical presence helped ensure that Guehi was playing for Chelsea under-18s as a 15-year-old but he is also very assured in possession, impressing with the ball at his feet.
It's another very assured appearance from Goode, albeit in an undemanding part.
