hollowness
noun /ˈhɒləʊnəs/
  /ˈhɑːləʊnəs/
[uncountable]- the state of having a hole or empty space inside- He felt the hollowness in his stomach spreading.
 
- the way somebody's face looks when their eyes, cheeks, etc. sink deeply into the face- The hollowness and paleness had disappeared because she was healthy again.
 
- the quality of making a low sound like that made by an empty object when it is hit- His voice is rich and deep, yet you can hear a slight hollowness.
 
- the fact of not being sincere- This process has exposed the hollowness of international commitments at the UN.
 
- the fact of being without real value synonym emptiness (1)- the hollowness of the victory