1. made hard; hardened.
2. insensitive; indifferent; unsympathetic: They have a callous attitude toward the sufferings of others.
3. having a callus; indurated, as parts of the skin exposed to friction. verb (used with or without object)
4. to make or become hard or callous.
"polices can be callous in treatments."
"people can be callous."
"disregards can be callous."
"killings can be callous."
"murders can be callous."
This list can help you learn new vocabulary more quickly and be able explore other words more easily.