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