The phrase "a highly diligent" is correct and usable in written English.
It can be used to describe someone who is very hardworking and attentive to detail.
Example: "She is a highly diligent student who always submits her assignments on time and goes above and beyond in her studies."
Alternatives: "extremely hardworking" or "very meticulous".
A statement released after his death described him as "a highly diligent intern at our company with a bright future".
Moritz Erhardt was popular amongst his peers and was a highly diligent intern at our company with a bright future".
"He was popular amongst his peers and was a highly diligent intern at our company with a promising future".
In a statement, the bank said Erhardt was "popular among his peers and was a highly diligent intern at our company with a promising future".
It has ample natural resources, a highly educated, diligent workforce and is situated in an advantageous geographical position.
Twice in the match they had overcome tricky starts against urgent new-ball bowling – 34 for three in the first innings and 52 for three in the second – each time grateful for a highly-skilled, diligent century around which the other batsmen could prosper.
The United States has a highly engaged, approachable and diligent ambassador in place.
The result is a well-educated, highly skilled diligent work force and large pools of capital.
Students who are interested in applying should expect to demonstrate a highly challenging course load in high school combined with diligent work habits.
In the Senate, his colleagues have praised him as a diligent worker, a savvy politician and, of course, a highly effective fund-raiser.
It came just as a highly charged verdict is expected in the trial of a former head of military intelligence for the 1998 murder of Bishop Juan Gerardi Conedera, a diligent human rights advocate.
