Cruel (adjective)

1. Willing to cause pain or suffering to others.
2. Displaying a lack of compassion or empathy.
3. Inhumanly brutal or savage.

Origin:

From middle english crul, from old french cruel, from latin crudelis ("cruel, savage, harsh"), from crudus ("raw, rough, hars.h")

Examples:

1. He had a cruel streak and enjoyed watching others suffer.
2. The dictator was known for his cruel regime.
3. The punishment was cruel and inhumane.
4. The animal was treated with cruelty.
5. The comments were cruel and hurtful.