hollow

a cavity or space in something; "hunger had caused the hollows in their cheeks"

a small valley between mountains; "he built himself a cabin in a hollow high up in the Appalachians"

a depression hollowed out of solid matter

remove the inner part or the core of; "the mining company wants to excavate the hillside"

remove the interior of; "hollow out a tree trunk"

not solid; having a space or gap or cavity; "a hollow wall"; "a hollow tree"; "hollow cheeks"; "his face became gaunter and more hollow with each year"

as if echoing in a hollow space; "the hollow sound of footsteps in the empty ballroom"

devoid of significance or point; "empty promises"; "a hollow victory"; "vacuous comments"