When it comes to describing someone's actions towards another person, the term "cruel to" can be quite limiting. There are many other words and phrases that can be used to convey cruelty. For instance, you might say that someone is harsh, unkind, or callous. You could also describe their behavior as brutal, heartless, or unfeeling. Other options might include words like inhumane, sadistic, or vicious. Ultimately, the choice of synonym will depend on the context and the degree of cruelty being described. Whether you're writing a novel, an essay, or simply trying to express yourself, it's important to choose the right words to convey the appropriate tone and message.