| Singular | Plural | |
|---|---|---|
| Nominativ | charybdis | charybdes |
| Genitiv | charybdis | charybdum, charybdium |
| Dativ | charybdi, charybde | charybdibus |
| Akkusativ | charybdem, charybdim | charybdes, charybdis, charybdeis |
| Ablativ | charybdi, charybde | charybdibus |
| Vokativ | charybdis | charybdes |