| srpski | srp-001 |
| težak | |
| العربية | arb-000 | صعب |
| PanLem | art-000 | dif |
| беларуская | bel-000 | цяжкі |
| bosanski | bos-000 | težak |
| български | bul-000 | труден |
| bălgarski ezik | bul-001 | trúden |
| català | cat-000 | dificil |
| čeština | ces-000 | obtížný |
| ѩзыкъ словѣньскъ | chu-000 | тѧжкъ |
| slověnĭskŭ językŭ | chu-001 | tęžkŭ |
| Deutsch | deu-000 | hart |
| Deutsch | deu-000 | schwierig |
| English | eng-000 | difficult |
| English | eng-000 | hard |
| English | eng-000 | ponderous |
| English | eng-000 | severe |
| English | eng-000 | stiff |
| English | eng-000 | stodgy |
| English | eng-000 | weighty |
| 𐐀𐑍𐑊𐐮𐑇 | eng-006 | 𐐼𐐮𐑁𐐮𐐿𐐲𐑊𐐻 |
| Australian English | eng-009 | difficult |
| New Zealand English | eng-010 | difficult |
| Esperanto | epo-000 | malfacila |
| euskara | eus-000 | zail |
| suomi | fin-000 | vaikeus |
| français | fra-000 | difficile |
| français | fra-000 | dur |
| Српскохрватски | hbs-000 | тежак |
| Srpskohrvatski | hbs-001 | težak |
| magyar | hun-000 | kemény |
| italiano | ita-000 | difficile |
| italiano | ita-000 | duro |
| la lojban. | jbo-000 | nandu |
| 日本語 | jpn-000 | 困難 |
| Nihongo | jpn-001 | konnan |
| にほんご | jpn-002 | こんなん |
| нихонго | jpn-153 | коннан |
| latine | lat-000 | durus |
| македонски | mkd-000 | тешки |
| bokmål | nob-000 | vanskelig |
| polski | pol-000 | trudny |
| português | por-000 | difícil |
| português | por-000 | duro |
| português brasileiro | por-001 | difícil |
| português europeu | por-002 | difícil |
| русский | rus-000 | трудный |
| slovenčina | slk-000 | obtiažny |
| slovenščina | slv-000 | težek |
| español | spa-000 | difícil |
| español | spa-000 | duro |
| српски | srp-000 | тежак |
| Türkçe | tur-000 | güç |
| українська | ukr-000 | важкий |