| Singular | Plural | |
|---|---|---|
| Nominativ | contubernius | contubernii |
| Genitiv | contubernii | contuberniorum |
| Dativ | contubernio | contuberniisque, contuberniis |
| Akkusativ | contuberniom, contubernium | contubernios |
| Ablativ | contubernio | contuberniisque, contuberniis |
| Vokativ | contubernie | contubernii |