Filthy is an adjective that means dirty, unclean, or covered in dirt and grime. Some synonyms for the word filthy include disgusting, grimy, soiled, polluted, foul, unhygienic, and mucky. These words can be used to describe anything that is dirty, filthy, or unclean. For instance, a filthy bathroom can be described as disgusting or dirty. Similarly, a grimy kitchen can be described as polluted or unhygienic. The word filthy can also be used to describe the behavior of a certain person who has a lack of respect for cleanliness. In conclusion, there are many synonyms for the word filthy, each representing a different degree of disgust and uncleanliness.