| Singular | Plural | |
|---|---|---|
| Nominativ | infirmum, infirmumque, infirmom | infirma, infirmaque |
| Genitiv | infirmi | infirmorum |
| Dativ | infirmo | infirmis |
| Akkusativ | infirmum, infirmumque | infirma, infirmaque |
| Ablativ | infirmo | infirmis |
| Vokativ | infirmum, infirmumque | infirma, infirmaque |