When describing areas that have become dilapidated or rundown, it's important to use a variety of synonyms to avoid repetitive phrasing. Some synonyms for "rundown neighborhoods" include decaying districts, deteriorating areas, neglected communities, shabby sections, and slum regions. Other words to consider might include blighted spaces, impoverished zones, seedy locales, or underserved boroughs. Each of these alternatives conveys a slightly different nuance of meaning, depending on the specific context and audience. By utilizing a diverse vocabulary when describing rundown neighborhoods, writers can paint a more descriptive and nuanced picture of the communities in question.