made hard; hardened.

insensitive; indifferent; unsympathetic

They have a callous attitude toward the sufferings of others.

having a callus; indurated, as parts of the skin exposed to friction.

to make or become hard or callous.

adjective

compassionate , feeling , kind , nice , sensitive , sympathetic , tender

adjective

apathetic , blind to , careless , case-hardened , cold , cold-blooded , deaf to , hard , hard-bitten , hard-boiled , hardened , hardhearted , heartless , impassive , impenitent , indifferent , indurated , inflexible , insensate , insensible , insensitive , insentient , inured , obdurate , soulless , spiritless , stiff , stony , stubborn , thick-skinned , torpid , tough , toughened , unaffected , unbending , uncaring , uncompassionate , unconcerned , unfeeling , unimpressionable , unresponsive , unsusceptible , unsympatheticnotes:callus is a hard patch of skin; callous is an adjective meaning \'indifferent to suffering\' or \'hardened\' , cold-hearted , compassionless , stonyhearted , adamant , anesthetic , brawny , cruel , emotionless , horny , impertinent , indurative , inexorable , obtuse , unimpressible