Your copy editor would point out it should be "well," or perhaps, awkwardly, "greatly."
My copy editor <<1>> can eat a bag of dicks, because the English language is vast and if your meaning is towards the unambiguous end of the spectrum, who gives a fuck if it's well or great or greatly?
You'll note, of course, that I use plenty of colloquialisms throughout my postings -- it's more towards how I speak, and I feel no requirement, nor any particular draw towards the sort of formalism that cares if it's great or well.
(Although, to be entirely fair, "less" and "fewer" misusage is like nails on the chalkboard, even though they effectively mean the same thing. It's rare that using the "wrong" one leaves a question of meaning. Who knows. Everyone's got their own grammar gremlins, I suppose.)
...
<<1>> I have been employed as a copy editor. Grammarly sort of killed that job; no one
enjoys being corrected, and damn near err'body thinks they're a better writer than they are. In this year of Our Lord 2025, copy editor is a job far too many people view the same way they'd view "spell checker" as a job, when copy is more about macro structure than about "is a semi-colon appropriate, or should that be an em-dash or a comma?"
If you'll excuse me, my friend is going to come semi my colon. Happy 4th. MA(slightly less stupid and slightly more nice)A!