| Lingwa de Planeta | art-287 |
| mushkile | |
| Sambahsa-mundialect | art-288 | difficil |
| Deutsch | deu-000 | schwierig |
| English | eng-000 | difficult |
| English | eng-000 | hard |
| Esperanto | epo-000 | malfacila |
| Nederlands | nld-000 | moeilijk |
| Novial | nov-000 | desfasil |
| русский | rus-000 | затруднительный |
| русский | rus-000 | сложный |
| русский | rus-000 | трудный |
| русский | rus-000 | тяжёлый |