callous

[1]	cauterize , cauterise

adj.

[1]	hardened , thick-skinned , unfeeling , uncaring , insensible , insensitive , hard , hard-hearted , tough , hardbitten , cold , cold-hearted , heartless , indifferent , unsympathetic , apathetic , (Colloq) hard-boiled , hard-nosed
[2]	indurate , pachydermatous
[3]	calloused , thickened