The phrase "are enormously impressive" is correct and usable in written English.
You can use it to express admiration or appreciation for something that is significantly remarkable or outstanding.
Example: "The results of the research are enormously impressive, showcasing the team's hard work and dedication."
Alternatives: "are highly impressive" or "are exceptionally remarkable."
"She is enormously impressive, politically astute and a strong personality," he said.
The result is enormously impressive: page-turning but thoughtful; moving in its sad inevitability.
Many of the wines were still young, but 2000 Haut-Bailly was all elegance and class, 2005 Angelus was enormously impressive, 2006 Vieux Chateau Certan was velvety and open and 2003 Lafon-Rochet surprisingly fresh.
But, having been surprisingly sacked by Derby County in September, the way he has revived the fortunes of a side who were facing a prospective relegation battle when he succeeded David Weir a month later has been enormously impressive.
On the road, the E 300 BlueTEC Hybrid's drivetrain is enormously impressive, with the combined power, and in particular torque, of the diesel engine and electric motor providing very strong acceleration indeed.
"He possesses tremendous elevation, there is a cumulative pulse and rhythmic beat to his dancing that is enormously impressive," Clive Barnes wrote in The New York Times, describing Mr. Cragun's performance in "The Taming of the Shrew," which the Stuttgart company, based in Germany, brought to the Metropolitan Opera House in 1969.
To Rise Again at a Decent Hour at times struggles to bear the weight of its conceit (digressions into the history of the Amalekites confound after a while), but at its best it is enormously impressive: profoundly and humanely engaged with the mysteries of belief and disbelief, linguistically agile and wrongfooting, and dismayingly funny in the way that only really serious books can be.
Perhaps in the age of nationalism the Habsburg Empire was doomed, but its ability to keep so many disparate, conflicting groups effectively together is enormously impressive.
The consequences are enormously important.
Police shootings are enormously controversial.
