An unpleasant and dirty place or thing is described as filthy.
The word 'filthy' is often used to describe messy situations or things that people find disgusting. Imagine walking into a room with trash scattered all over the floor, dirty dishes piled up in the sink, and mold growing on the walls - it would be a very filthy space. People might also call someone who's acting recklessly or disrespectfully 'filthy', like if they're being incredibly rude at a dinner party. In this case, the word isn't just about dirt and mess, but about how someone's behavior is unacceptable.
Covered with filth; very dirty.
