Low-class and Slummy

Low-class adjective - Occupying the lowest socioeconomic position in a society.

Slummy and low-class are semantically related. In some cases you can use "Slummy" instead an adjective phrase "Low-class".

Slummy adjective - (of housing or residential areas) indicative of poverty.

Low-class and slummy are semantically related. Sometimes you can use "Low-class" instead an adjective "Slummy".