| català | cat-000 |
| dificil | |
| Afrikaans | afr-000 | moeilik |
| 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 |
| čeština | ces-000 | obtížný |
| Chamoru | cha-000 | chátsaga |
| ѩзыкъ словѣньскъ | chu-000 | тѧжкъ |
| slověnĭskŭ językŭ | chu-001 | tęžkŭ |
| 普通话 | cmn-000 | 难 |
| dansk | dan-000 | hård |
| dansk | dan-000 | vanskelig |
| Deutsch | deu-000 | hart |
| Deutsch | deu-000 | schwer |
| Deutsch | deu-000 | schwierig |
| English | eng-000 | arduous |
| English | eng-000 | difficult |
| English | eng-000 | hard |
| English | eng-000 | inconvenient |
| English | eng-000 | tough |
| 𐐀𐑍𐑊𐐮𐑇 | eng-006 | 𐐼𐐮𐑁𐐮𐐿𐐲𐑊𐐻 |
| Australian English | eng-009 | difficult |
| New Zealand English | eng-010 | difficult |
| Esperanto | epo-000 | malfacila |
| Esperanto | epo-000 | malmola |
| euskara | eus-000 | gogor |
| euskara | eus-000 | zail |
| føroyskt | fao-000 | torførur |
| suomi | fin-000 | kova |
| suomi | fin-000 | vaikea |
| suomi | fin-000 | vaikeus |
| français | fra-000 | difficile |
| français | fra-000 | dur |
| Frysk | fry-000 | hurd |
| lenghe furlane | fur-000 | hurd |
| Gàidhlig | gla-000 | cruaidh |
| Gàidhlig | gla-000 | doirbh |
| עברית מקראית | hbo-000 | קשה |
| Српскохрватски | hbs-000 | тежак |
| Srpskohrvatski | hbs-001 | težak |
| magyar | hun-000 | kemény |
| magyar | hun-000 | nehéz |
| Ido | ido-000 | harda |
| Ido | ido-000 | severa |
| bahasa Indonesia | ind-000 | bengis |
| bahasa Indonesia | ind-000 | keras |
| bahasa Indonesia | ind-000 | payah |
| íslenska | isl-000 | harður |
| íslenska | isl-000 | vandur |
| íslenska | isl-000 | þungur |
| italiano | ita-000 | difficile |
| italiano | ita-000 | dura |
| italiano | ita-000 | pesante |
| 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 |
| Nederlands | nld-000 | hard |
| Nederlands | nld-000 | lastig |
| Nederlands | nld-000 | moeilijk |
| Nederlands | nld-000 | onzacht |
| Nederlands | nld-000 | slim |
| Nederlands | nld-000 | stug |
| Nederlands | nld-000 | zwaar |
| bokmål | nob-000 | hård |
| bokmål | nob-000 | vanskelig |
| occitan | oci-000 | dificil |
| occitan | oci-000 | dur |
| Papiamentu | pap-000 | difísil |
| Papiamentu | pap-000 | duru |
| Papiamentu | pap-000 | fregá |
| polski | pol-000 | trudny |
| português | por-000 | afanoso |
| português | por-000 | dificultoso |
| português | por-000 | difícil |
| português | por-000 | duro |
| português brasileiro | por-001 | difícil |
| português europeu | por-002 | difícil |
| română | ron-000 | dur |
| română | ron-000 | greu |
| română | ron-000 | tare |
| русский | rus-000 | трудный |
| slovenčina | slk-000 | obtiažny |
| slovenščina | slv-000 | težek |
| español | spa-000 | dificil |
| español | spa-000 | difícil |
| español | spa-000 | duro |
| español | spa-000 | firme |
| српски | srp-000 | тежак |
| srpski | srp-001 | težak |
| svenska | swe-000 | hård |
| svenska | swe-000 | mödosam |
| svenska | swe-000 | svår |
| Tagalog | tgl-000 | hírap |
| Tagalog | tgl-000 | mahírap |
| Tagalog | tgl-000 | matigás |
| Türkçe | tur-000 | güç |
| українська | ukr-000 | важкий |
| Maaya Tʼaan | yua-000 | yah |
| Bahasa Malaysia | zsm-000 | payah |