Slums adjectives are listed in this post. Each word below can often be found in front of the noun slums in the same sentence. This reference page can help answer the question what are some adjectives commonly used for describing SLUMS.
back, crowded
filthy, overcrowded
squalid, urban
worst
Hope this word list had the adjective used with slums you were looking for. Additional describing words / adjectives that describe / adjectives of various nouns can be found in the other pages on this website.
Polluted
unhygienic
Overpopulated
smelly