The phrase "a very adept" is correct and usable in written English.
It can be used to describe someone who is highly skilled or proficient in a particular area or task.
Example: "She is a very adept musician, able to play multiple instruments with ease."
Alternatives: "a highly skilled" or "an extremely proficient".
Gray was simply a very adept inventor.
Not a very adept one as it happens.
The London mayor described him as "eel-like" and a "very adept and agile lawyer".
Instead, what they saw was a dynamo, and a very adept political operator.
Taylor called him "a very adept looter" who "cut through high levels of security".
"He is a very adept storyteller," James R. Gaines wrote here in 1998.
We had an Administration very adept at convincing a good deal of the population that 2 + 2 = 5 (e.g. that Saddam was "behind the September 11 attacks, and had WMD); under the new Administration, whatever its faults (and there will be many, I am sure) we are at least learning how to count again, and not queer the numbers of truth.
Dr. Hauser says that the first group of tamarins he tested for self-recognition may have included a few very adept individuals but that later groups were more average.
"It was a combination of very adept nonprofits, help from the feds for this specific purpose and local political will from elected officials," he said.
For a party that in a sense has been very adept at the good times in developing a very aspirational script, particularly when money was not really an object and you could just bandy about promises, but not perhaps leavening that with also a sense that you need a certain credibility before you can get a hearing.
I've never been a one-day-at-a-time type; I'm very adept at blocking out the things about myself and my past that I don't want to see.
