| Singular | Plural | |
|---|---|---|
| Nominativ | inane | inania, autinania |
| Genitiv | inanis, inanissima, inanissimi, inanissimis, huinanis | inanium, inanum |
| Dativ | inanique, inane, inani, inaniter, inaniora | inanibus |
| Akkusativ | inane | autinania, inania |
| Ablativ | inaniora, inanique, inani, inaniter, inane | inanibus |
| Vokativ | inane | inania, autinania |