n. 1. The state or quality of having crust or being like crust; hardness. [ 1913 Webster ]
2. The quality of being crusty or surly. [ 1913 Webster ]
Old Christy forgot his usual crustiness. W. Irving. [ 1913 Webster ]
n. The quality or state of being rusty. [ 1913 Webster ]
n. The quality or state of being trusty. [ 1913 Webster ]