The term "nasty neighbour effect" is used to describe the negative impact that bad neighbours can have on a community and the people living in it. There are several synonyms for this term, including "toxic neighbour syndrome," "neighbourhood blight," and "neighbourhood nightmare." These terms all describe the same phenomenon of neighbours who behave in ways that are disruptive, disrespectful, or harmful to their neighbours. Some other related terms include "neighbourhood deterioration," "neighbourhood decay," and "neighbourhood decline," which describe how the presence of bad neighbours can contribute to a decline in the quality of life for the entire community. Ultimately, no matter what you call it, the nasty neighbour effect is something that can have a profound effect on the well-being of those who have to live with it.