'Cruel' in the Bible

A person of kindness rewards himself, but a cruel [person] harms his own flesh.

The righteous knows the life of his animal, but the compassion of the wicked is cruel.

An evil person will seek only rebellion, and a cruel messenger will be sent against him.

Cruel [is] wrath and overwhelming [is] anger, but who will stand before jealousy?

A ruler who lacks understanding is a cruel oppressor, [but] those who hate unjust gain will have long days.