[noun] the firmness and tone of healthy tissue; "his muscle firmness" Synonyms:soundness
[noun] the trait of being resolute; firmness of purpose; "his resoluteness carried him through the battle"; "it was his unshakeable resolution to finish the work" Synonyms:resoluteness, resolve, resolution
[noun] the property of being unyielding to the touch
[noun] the quality of being steady or securely and immovably fixed in place Synonyms:steadiness