cal·los·i·ty 
(kə-lŏsĭ-tē)
(kə-lŏsĭ-tē)n. pl. cal·los·i·ties
1. The condition of being calloused. Also called tylosis.
2. Hardheartedness; insensitivity.
3. See callus.
[Middle English callosite, from Old French, from Late Latin callōsitās, from Latin callōsus, callous; see CALLOUS.]