hollower

/HH AA1 L OW0 ER0/
adjective
  1. 1

    (of something solid) Having an empty space or cavity inside.

    โ€œa hollow tree; a hollow sphereโ€

  2. 2

    (of a sound) Distant, eerie; echoing, reverberating, as if in a hollow space; dull, muffled; often low-pitched.

    โ€œHe let out a hollow moan.โ€

  3. 3

    Without substance; having no real or significant worth; meaningless.

    โ€œa hollow victoryโ€

  4. 4

    Insincere, devoid of validity; specious.

    โ€œa hollow promiseโ€

  5. 5

    Concave; gaunt; sunken.

  6. 6

    Pertaining to hollow body position

noun
  1. 1

    One who or that which hollows something.

Source: https://en.wiktionary.org/wiki/hollow, https://en.wiktionary.org/wiki/hollower