| Singular | Plural | |
|---|---|---|
| Nominativ | aerumnula | aerumnulae |
| Genitiv | aerumnulae, aerumnulai | aerumnularum, aerumnulum |
| Dativ | aerumnulae, aerumnulai | aerumnulis, aerumnulabus |
| Akkusativ | aerumnulam | aerumnulas |
| Ablativ | aerumnula, aerumnulad | aerumnulis, aerumnulabus |
| Vokativ | aerumnula | aerumnulae |