| Part of speech | unknown part of speech |
|---|
| Singular | Plural | |
|---|---|---|
| Nominative | idiosinkrazio | idiosinkrazioj |
| Accusative | idiosinkrazion | idiosinkraziojn |
| Catalan | idiosincràsia |
|---|---|
| Dutch | idiosyncrasie; overgevoeligheid |
| English | idiosyncrasy |
| German | Idiosynkrasie |
| Spanish | idiosincracia |