"hollow" in the noun sense
1. hollow
a cavity or space in something
"hunger had caused the hollows in their cheeks"
2. hollow, holler
a small valley between mountains
"he built himself a cabin in a hollow high up in the Appalachians"
3. hole, hollow
a depression hollowed out of solid matter
"hollow" in the verb sense
1. excavate, dig, hollow
remove the inner part or the core of
"the mining company wants to excavate the hillside"
2. hollow, hollow out, core out
remove the interior of
"hollow out a tree trunk"
"hollow" in the adjective sense
1. 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"
2. hollow
as if echoing in a hollow space
"the hollow sound of footsteps in the empty ballroom"
3. empty, hollow, vacuous
devoid of significance or force
"empty promises"
"a hollow victory"
"vacuous comments"
4. hollow
lacking in substance or character
"a hollow person"
Source: WordNet® (An amazing lexical database of English)
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