"a hollow wall"; "a hollow tree"; "hollow cheeks"; "his face became gaunter and more hollow with each year"
is similar to
being or suggesting a cavern
"vast cavernous chambers hollowed out of limestone"
is similar to
having a sunken area
"hunger gave their faces a sunken look"
is similar to
hollow and tube-shaped like a reed
is similar to
constituting a tube; having hollow tubes (as for the passage of fluids)
see also
holding or containing nothing
"an empty glass"; "an empty room"; "full of empty seats"; "empty hours"
is an attribute of
state of having the interior filled with matter