There were once a brother and sister who loved each other dearly; their mother was dead, and their father had married again a woman who was most unkind and cruel to them.
The feudal barons were cruel to the people.
The hunter thought carefully. He realized that he had been cruel to shoot defenseless birds. He threw his gun in the river and went into the fresh produce business.
A man who is cruel to you doesn't mean that he is good for you. A person's kindness to you doesn't mean he doesn't hate you.
Years ago, she had been cruel to someone and had never acknowledged her actions.
And this is line 679: Why should you be so cruel to yourself, and to those dainty limbs which nature lent For gentle usage and soft delicacy?
Wherefore art thou so cruel to all who need pity?
We shouldn't be cruel to animals.