| Nederlands | nld-000 |
| lastigheid | |
| Deutsch | deu-000 | Schwierigkeit |
| English | eng-000 | difficulty |
| English | eng-000 | intractability |
| English | eng-000 | toughness |
| Esperanto | epo-000 | malfacileco |
| suomi | fin-000 | vaikeus |
| français | fra-000 | difficulté |
| Nederlands | nld-000 | hardnekkigheid |
| Nederlands | nld-000 | moeilijkheid |
| Papiamentu | pap-000 | difikultat |
| português | por-000 | dificuldade |
| español | spa-000 | dificultad |
| español | spa-000 | intratable |
| svenska | swe-000 | svårighet |