| Sambahsa-mundialect | art-288 |
| kaurd | |
| Lingwa de Planeta | art-287 | twerde |
| Deutsch | deu-000 | fest |
| Deutsch | deu-000 | hart |
| English | eng-000 | firm |
| English | eng-000 | hard |
| Esperanto | epo-000 | dura |
| Esperanto | epo-000 | malmola |
| français | fra-000 | dur |
| Nederlands | nld-000 | hard |
| Novial | nov-000 | solid |
| русский | rus-000 | твёрдый |
| español | spa-000 | duro |