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