Blindfish is a term used to describe a family of fish that live in underground waters and have adapted to live in total darkness. Some synonyms for the word include cavefish, subterranean fish, and cave-dwelling fish. Others include troglobites, which refers to animals that have adapted to live exclusively in caves, and stygofauna, which denotes animals that inhabit underground waters. Other related terms include hypogean fish, which describes fish that live underground, and troglomorphs, which describes animals that have evolved to adapt to life in underground habitats. These synonyms are useful for describing the unique and fascinating world of fish that inhabit the subterranean waters.