Leather-burning refers to harsh, cruel, and inhumane behavior that causes intense suffering to someone. It's a term used to describe someone who is excessively cruel or uses brutality. Thankfully, there are many synonyms for this term, some of which include merciless, savage, brutal, heartless, and sadistic. These words all have a similar connotation of extreme cruelty, callousness, and a total disregard for the feelings of others. Whether you're writing an essay, article, or blog post, using synonyms for leather-burning can effectively convey the intensity of the situation and the severity of the person's actions.