"completely hollow" is correct and can be used in written English.
You can use it to describe something that is empty or without any substance. For example, "This article is completely hollow - it does not contain any useful information."
But any promise for global megabanks that we would "just let them fail" is completely hollow.
"It was sweet on the outside and completely hollow on the inside.
"They are good at pomp, parades and ceremony, but otherwise it's completely hollow," says a Western military man.Corruption in the force is endemic and foreign operations are popular as cash cows.
She was more disturbed about Betty's dramatic decision to leave the church shortly after she had been baptized into it, and her increasing fascination with the novels of Iris Murdoch, whose work Flannery found "completely hollow".
But that claim is completely hollow since companies like the McMillan Group and Magpul support the association through corporate donations and other initiatives like a giveaway of ammunition magazines and other equipment on the association's Facebook page that was later taken down.
Doug Farrar, Shutdown Corner: Goodell's next act must be to realize that Williams' apology is completely hollow, that his repugnant modus operandi will remain under other names and guises unless it is killed forever, and that removing Williams from the game on a lifetime basis is the best way to start.
Just before Malawi's institutions had been completely hollowed out, before a succession plan had been cemented – Mutharika died.
I don't want to see a Britain where we have our manufacturing, what's left of it, completely hollowed out.
"It is also possible that really old trees could be so damaged by this fungus that they are actually completely hollowed out and no longer actually a source of methane at all, because the anaerobic conditions required for methanogens would no longer exist," he added.
The interior of the products is completely hollowed and the shell is comprised of numerous nanoparticles.
In his 1965 book Beyond Tomorrow: The Next 50 Years in Space, he explains that these "gold mines in the sky" would eventually be completely hollowed out and designed to fit up to a million people living in an "inside-out world".
