callous | callously | callousness

The term ‘callous’ is used in relation to people’s behaviour and attitude. A callous person does not feel any emotion when they see somebody in trouble or pain. They are unkind and devoid of sympathy in words and/or actions.

1. It might sound callous, but I'm glad David was fired. He used to always get on my nerves.

2. She behaved callously, showing a total disregard for the welfare of others.

3. The callousness of his murder was particularly upsetting. I don’t know how people can be capable of such things.