sturdiness

/ˈstɜrdinəs/
noun
  1. The quality of being strong, solid, and durable.
    • The sturdiness of the old barn amazed the architect.
    • Her backpack's sturdiness made it perfect for hiking.
    • We tested the sturdiness of the rope before climbing.
  2. The quality of being firm, determined, or resolute.
    • The sturdiness of her faith helped her through hard times.
    • His sturdiness of character earned him respect.
    • The leader's sturdiness inspired confidence in the group.