firmness

Noun

• the quality of being steady or securely and immovably fixed in place

• the property of being unyielding to the touch

• the trait of being resolute
  • his resoluteness carried him through the battle
    
  • it was his unshakeable resolution to finish the work
    

• the muscle tone of healthy tissue
  • his muscular firmness
    

Related words

• Synonyms: 
  steadiness , resoluteness , firmness of purpose , resolve , resolution , soundness
• Antonyms: 
  unsteadiness , ricketiness , irresoluteness , irresolution , unsoundness