SQUALID SPACE is a term used to describe a living or working environment that is in a state of disrepair and neglect. It is often characterized by a lack of basic amenities, such as running water, electricity, and sanitation. The term STY, which is a three-letter solution to the crossword, is an acronym for 'Stagnant, Unsanitary, and Yucky, ' which are all words that can be used to describe a squalid space.