firmness

plural firmnesses

1. The state of being firm
   1. countableuncountablesecurity; steadfastness; good grip
   2. countableuncountablestrictness; mental strength

      France, for the first time since the death of Charlemagne, was governed by a prince of great firmness and ability.

      1849–1861, Thomas Babington Macaulay, The History of England from the Accession of James the Second, volume (please specify |volume=I to V), London: Longman, Brown, Green, and Longmans, →OCLC

      1 more example

      But many a man who would have stood within a home dismantled, strong in his passion and design of vengeance, has had the firmness of his nature conquered by the razing of an air–built castle.

      1842 December – 1844 July, Charles Dickens, chapter 23, in The Life and Adventures of Martin Chuzzlewit, London: Chapman and Hall, […], published 1844, →OCLC

   3. countableuncountablephysical durability; rigidness (of material)