The word "more senatorial" implies a comparison with a certain level of behavior, conduct, or aura that is typically associated with senators. However, if we are to consider antonyms for this phrase, we may come up with words that contradict or oppose these senatorial attributes. For instance, we can describe someone as less senatorial if they are unprofessional, unconventional, or unrefined. They may lack the poise, eloquence, or political savvy that senators are expected to possess. They may also exhibit qualities that are not conducive to building consensus or serving the public interest, such as ruthlessness, arrogance, or dishonesty. Ultimately, the opposite of "more senatorial" will depend on the context and criteria we use to evaluate a person's performance or demeanor.