behaviour that is unkind, cruel, and without sympathy or feeling for other people

She felt the rules showed a callousness and indifference to the suffering of others. 她觉得这些规则表现出一种冷酷无情，对他人的痛苦漠不关心。

I am appalled by the callousness of some business people. 我对一些商人的冷酷无情感到震惊。