| Singular | Plural | |
|---|---|---|
| Nominativ | agnosticismus | agnosticismi |
| Genitiv | agnosticismi | agnosticismorum, agnosticismum |
| Dativ | agnosticismo | agnosticismis |
| Akkusativ | agnosticismom, agnosticismum | agnosticismos |
| Ablativ | agnosticismo | agnosticismis |
| Vokativ | agnosticisme | agnosticismi |