The phrase "almost as empty" is correct and usable in written English.
It can be used to compare the emptiness of two things, indicating that one is nearly as empty as the other.
Example: "The room was almost as empty as the warehouse next door."
Alternatives: "nearly as vacant" or "practically as hollow".
By midday, The Times-Picayune newsroom was almost as empty as the bottle of booze that someone had brought in that morning and set up in the Money section.
The ground had been almost as empty the previous day against Sri Lanka, with only 3,989 in attendance, and even on Sunday, when tickets cost a reasonable £20 and £5 for concessions, a crowd of 6,700 left Headingley – whose capacity of 16,000 is the smallest of the six venues staging Tests this summer – more than half empty.
And more often, Trump speaks of Wharton with no details at all — almost as an empty token of his brilliance and success.
Both players hurried on, raised the silverware and hurried off, while in the rain-soaked stands, where there were almost as many empty blue seats as flag-waving fans, only mild appreciation was shown.
The trucks are emptied almost as soon as they arrive, and the wood is carted off in bags and strollers.
Lapita: Oceanic Ancestors at the Musée du Quai Branly, in Paris, is the first exhibition on mainland France to focus on one of the oldest civilisations of Oceania, a continent long considered as empty, or almost.
"Partner" was unclear, empty, and almost as closeted as "friend".
He has been charged with the task of providing a seat that will absorb almost as much sound when it's empty as when it is occupied.
It was almost as if the cathedral was an empty shell which it most definitely isn't.
It's almost as if the bombs are falling on empty buildings.
Empty condo towers are almost as common as palm trees.
