The antonyms for the word "slummier" are words that describe cleaned-up, upscale, and fashionable areas. Some of the opposite words for "slummier" include luxurious, affluent, elegant, upscale, posh, and fashionable. These words are linked to areas that are associated with wealth, prosperity, and upper-class living. When we describe a place as "slummier," it means that the area is rough, rundown, and unattractive. Antonyms such as luxurious and upscale are often associated with high-end living, where the surroundings are pleasant and stylish. These antonyms bring up images of fancy homes, expensive cars, high-end restaurants, and glitzy shopping districts, which are contrasting to the run-down areas that are culturally and economically depressant.