This is definitely possible.
I agree - "This is definitely possible."
I think "durchaus" also means "quite" according to my dictionary, but it wasn't accepted. I'll report it and see.
"Quite possible" / "durchaus möglich" is even one of the examples given at Pons, so they should add it.
How about "This is indeed possible"? If it's wrong, then what is the word for "indeed"?
audio speaks durchaus as two words but it is pronnounced as one. Important for some words like nachdem and vielmehr which have different meanings depending on whether they are 1 or 2 words