hollow
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"
Antonym:
solid
Nearest:
cavernous
deep-set; sunken; recessed
fistular; fistulate; fistulous
tubular; cannular; tubelike; tube-shaped; vasiform
WordNet Lexical Database
v3.0, © 2006 Princeton University