hollowness
(noun)
noun
1. the state of being hollow: having an empty space within
Definition categories: state, emptiness
2. the property of having a sunken area
Definition categories: attribute, concaveness, concavity
3. the quality of not being open or truthful; deceitful or hypocritical
Similar word(s): falseness, insincerity
Definition categories: attribute, untruthfulness