| Singular | Plural | |
|---|---|---|
| Nominativ | tonitrus | tonitrus, tonitruus |
| Genitiv | tonitri, tonitrus, tonitros | tonitrum, tonitruum |
| Dativ | tonitruque, tonitru, tonitrui | tonitribus, tonitribusque, tonitrubus |
| Akkusativ | tonitrum | tonitrus, tonitruus |
| Ablativ | tonitruque, tonitru | tonitribus, tonitribusque, tonitrubus |
| Vokativ | tonitrus | tonitrus, tonitruus |