This term refers to a lack of compassion or a tendency to cause suffering to others without remorse. It is often used to describe actions or individuals who are merciless in nature.

This meaning denotes an emotional detachment or indifference to the feelings of others, often implying a failure to empathize.

This indicates an unyielding and persistent nature, often applied to situations or behaviors that continue without interruption or pity.

This refers to a willingness to pursue one's goals without regard for the pain inflicted on others, often associated with aggressive or strategic actions.