She treated him cruellie.

Her cruel-heartedness was evident in the way she treated her subordinates.

Her cruelheartedness towards animals was evident in her treatment of stray cats.

She spoke cruel-heartedly to her subordinates.

He is known for his cruel-hearted actions.

She was known for her cruelhearted behavior towards animals.

The cruelnesses of war are unimaginable.

The surgeon observed several cruentations during the operation.

I only buy cruelty-free products.

The cruelties committed during the war were unimaginable.