sturdiness
noun /ˈstɜːdinəs/
  /ˈstɜːrdinəs/
[uncountable]- the quality of being physically strong or well made and not easily damaged synonym robustness (2)
- Test the sturdiness of several models in the store before deciding.
 
 - the quality of not being easily influenced or changed by other people
- the sturdiness of their folk traditions