Imperatorial is a word that is often used to describe the behavior or mannerisms of someone who holds an authoritative or sovereign position. There are several synonyms or alternative words that can be used to convey a similar meaning to imperatorial. These include words such as autocratic, dictatorial, despotic, authoritarian, and commanding. Other words that can be used include overbearing, domineering, high-handed, and assertive. Each of these words implies a sense of control or authority, which are key aspects of being imperatorial. As such, these synonyms can be useful when trying to describe someone who exhibits these kinds of traits or behaviors.