The phrase "enormously intelligent" is correct and can be used in written English.
You can use it when talking about someone or something that is exceptionally intelligent. For example, "Frank proved himself to be an enormously intelligent student, graduating with highest honors from the university."
"She's enormously intelligent and articulate, but intelligence alone doesn't write a play like this, which is so emotionally accessible as well as intellectually fulfilling".
The Times April 26 The Conservative candidate is an enormously intelligent man.
When Donald was sober he was enormously intelligent and pleasant, but of course he drank so terribly.
It is enormously intelligent, but all of the allusion is beneath the surface; it is as "literary" as "Eight White Nights" but never self-consciously so.
And at 48 years old, Mr. Bouley is engaging, enormously intelligent and an inexhaustible fountain of ideas on subjects including cooking and design.
"He was enormously intelligent and enormously crude, and he said then that he had a recurring dream that he would be King of the Earth," Mr. Butler said.
But he was enormously creative and intelligent, and he seemed to sense that the fashion industry needed to have its buttons pushed.
At night, though, things ramp up and out come the Volatiles, enormously mobile highly intelligent beasts with devastating attacks and the ability to track you.
She's just the kind of person we need, madly intelligent, enormously compassionate, quick to learn and better to clearly explain complex issues.
Lloyd Webber said: "Mandy was enormously well read and intelligent.
This most intelligent painter is enormously prolific, and works in diverse, unexpected ways, yet his work's overall coherence and power becomes more apparent as time goes on.
