robustness
noun /rəʊˈbʌstnəs/
  /rəʊˈbʌstnəs/
[uncountable]- the state of being strong and healthy synonym strength (1)
- His mental robustness helped him to cope in the aftermath of the trial.
 
 - the quality of being strong and unlikely to break or fail synonym sturdiness (1)
- Materials were chosen for their robustness and ease of maintenance.
 
 - the quality of being strong enough to be trusted or relied on
- They questioned the robustness of the evidence.
 
 - the quality of being strong and determined because you are sure about what you are doing or saying 
- She confronted her critics with typical robustness.