Is violent refers to an action or behavior that is aggressive, forceful, or brutal. There are many synonyms for this phrase that convey this type of behavior. Some examples include: is aggressive, is combative, is destructive, is fierce, is hostile, is intense, is raging, is rough, is severe, is savage, is tumultuous, is wild, is ferocious, is merciless, is ruthless, and is vicious. These synonyms all imply a level of physical or emotional force that can be harmful or dangerous. It is important to recognize when someone or something is exhibiting violent behavior in order to maintain safety and prevent harm to others.