Definition of "Hollow" :

noun: a depression hollowed out of solid matter

noun: a small valley between mountains

"He built himself a cabin in a hollow high up in the Appalachians."

noun: a cavity or space in something

"Hunger had caused the hollows in their cheeks."

verb: remove the interior of

"Hollow out a tree trunk."

verb: remove the inner part or the core of

adjective: lacking in substance or character

"A hollow person."

adjective: devoid of significance or force

"A hollow victory."

adjective: as if echoing in a hollow space

"The hollow sound of footsteps in the empty ballroom."

adjective: not solid; having a space or gap or cavity

"A hollow wall."