The word "assaultive" describes someone or something that is aggressive or threatening. Some antonyms for this word are passive, gentle, peaceful, calm, and non-violent. Passive implies lack of initiative or action, while gentle suggests a mild and kind manner. Peaceful indicates absence of conflict or disturbance, while calm denotes a state of serenity and tranquility. Non-violent specifically refers to the absence of physical force, and thus a complete opposite of assaultive. It is important to recognize and understand these antonyms in order to effectively communicate and accurately describe behavior or actions that are not aggressive or confrontational.