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Noun: hollowness  hó-low-nus
  1. The state of being hollow: having an empty space within
  2. The property of having a sunken area
  3. The quality of not being open or truthful; deceitful or hypocritical
    - insincerity, falseness

Type of: concaveness, concavity, emptiness, untruthfulness

Antonym: solidity