Source : Webster's Revised Unabridged Dictionary (1913)

Crustiness \Crust"i*ness\ (-[i^]-n[e^]s), n.
   1. The state or quality of having crust or being like crust;
      hardness.

   2. The quality of being crusty or surly.

            Old Christy forgot his usual crustiness. --W.
                                                  Irving.