hollow

(noun) a cavity or space in something. Example: "Hunger had caused the hollows in their cheeks."

(noun) a small valley between mountains. Synonyms: holler. Example: "He built himself a cabin in a hollow high up in the appalachians."

(noun) a depression hollowed out of solid matter. Synonyms: hole.

(verb) remove the inner part or the core of. Synonyms: excavate, dig. Example: "The mining company wants to excavate the hillside."

(verb) remove the interior of. Synonyms: hollow out, core out. Example: "Hollow out a tree trunk."

(adj) not solid; having a space or gap or cavity. Synonyms: hollow (vs. solid). Examples: "A hollow wall." "A hollow tree." "Hollow cheeks." "His face became gaunter and more hollow with each year."

(adj) as if echoing in a hollow space. Example: "The hollow sound of footsteps in the empty ballroom."

(adj) devoid of significance or point. Synonyms: empty, vacuous. Examples: "Empty promises." "A hollow victory." "Vacuous comments."