"hollower" 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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