firmness
     n 1: the firmness and tone of healthy tissue; "his muscle
          firmness" [syn: {soundness}]
     2: the trait of being resolute; firmness of purpose; "his
        resoluteness carried him through the battle"; "it was his
        unshakeable resolution to finish the work" [syn: {resoluteness},
         {resolve}, {resolution}] [ant: {irresoluteness}]
     3: the property of being unyielding to the touch
     4: the quality of being steady or securely and immovably fixed
        in place [syn: {steadiness}] [ant: {unsteadiness}]
Source: WordNet® 2.0