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Noun: firmness  furm-nus
  1. The muscle tone of healthy tissue
    "his muscular firmness";
    - soundness
  2. The trait of being resolute
    "his firmness carried him through the battle";
    - resoluteness, firmness of purpose, resolve, resolution
  3. The property of being unyielding to the touch
  4. The quality of being steady or securely and immovably fixed in place
    - steadiness

Type of: hardness, immovability, immovableness, strength, trait

Antonym: unsteadiness