robustness

robust +‎ -ness

robustness (countable and uncountable, plural robustnesses)

1. The quality of being robust.
   • 1960 March, “Talking of Trains: The Slough derailment”, in Trains Illustrated, page 132:

     The Inspecting Officer draws attention to the remarkable way in which the train held together after the final derailment; this was due in no small measure to the robustness of the buckeye couplings fitted to the coaches.

• subtensors