"Unfrieder" means someone who causes unrest or disturbance, often intentionally. When looking for synonyms to describe such behavior, there are several options available, such as "agitator," "troublemaker," "instigator," "provocateur," "inciter," and "disruptor." These terms all convey the sense of someone who is intentionally causing problems, whether it's through physical violence, emotional manipulation, or other means. They may be used to describe individual people or groups who are trying to create chaos and unrest in a given situation. By choosing the right synonym, writers can effectively convey the negative impact of these disruptive individuals on their surroundings.