| Unterwelt | Nominativ, Singular | nominative case, singular | |
| Unterwelte | Genitiv, Singular | genitive case, singular | |
| Unterwelten | Dativ, Singular | dative case, singular | |
| Unterwelt(e)s | Akkusativ, Singular | accusative case, singular | |
| Unterwelter | Nominativ, Plural | nominative case, plural | |
| Unterweltern | Genitiv, Plural | genitive case, plural | |
| Unterweltn | Dativ, Plural | dative case, plural |