Prowess is a related term of sturdiness.
As nouns the difference between prowess and sturdiness
is that prowess is skillfulness and manual ability; adroitness or dexterity while sturdiness is the state or quality of being sturdy.
prowess
English
Noun
Skillfulness and manual ability; adroitness or dexterity.
Distinguished bravery or courage, especially in battle; heroism
References
* The Oxford Paperback Dictionary fourth edition ISBN 0-19-280012-4
sturdiness
English
Noun
(-)
The state or quality of being sturdy.