firmness

/ˈfɜrmnəs/
noun
  1. The quality of being solid, hard, or not easily bent or pressed.
    • Test the firmness of the fruit by gently squeezing it.
    • The firmness of the mattress is important for a good night's sleep.
    • The clay's firmness made it easy to shape into a pot.
  2. The quality of being strong, steady, and not easily changed or influenced; determination.
    • Parents need a balance of firmness and kindness when raising children.
    • The manager showed firmness in enforcing the company's rules.
    • Her firmness of purpose helped her finish the marathon despite the pain.