| Mapudungun | arn-000 |
| küzawngelu | |
| aršatten č’at | aqc-000 | balatːut |
| LWT Code | art-257 | 17.47 |
| Kaliʼna | car-000 | tupime |
| 普通话 | cmn-000 | 难 |
| Hànyǔ | cmn-003 | nan2 |
| seselwa | crs-000 | difisil |
| Cheʼ Wong | cwg-000 | payɑh |
| Cheʼ Wong | cwg-000 | susɑh |
| dolnoserbska reč | dsb-000 | śěžki |
| English | eng-000 | difficult |
| diutisk | goh-000 | unsemfti |
| Gawwada—Dalpena | gwd-000 | rakko |
| Hausa | hau-000 | mài wùyáa |
| ʻōlelo Hawaiʻi | haw-000 | paʻakīkī |
| bahasa Indonesia | ind-000 | sukar |
| bahasa Indonesia | ind-000 | sulit |
| bahasa Indonesia | ind-000 | susah |
| Iraqw | irk-000 | gawid |
| 日本語 | jpn-000 | 困難 |
| 日本語 | jpn-000 | 難しい |
| Nihongo | jpn-001 | konnan |
| Nihongo | jpn-001 | muzukashii |
| Jupda | jup-000 | hamhũynɨ́h |
| bežƛʼalas mic | kap-001 | -äqʼqʼö |
| bežƛʼalas mic | kap-001 | zahmatab |
| Q’eqchi’ | kek-000 | ch'a'aj |
| Ket | ket-000 | səə |
| Kanuri | knc-000 | jâu |
| Hmoob Dawb | mww-000 | nyuab |
| Hmoob Dawb | mww-000 | nyuaj |
| Wichí Lhamtés Güisnay | mzh-000 | atha |
| Nederlands | nld-000 | moeilijk |
| Manang | nmm-000 | 4kole-1kʰʌ |
| Orochon | orh-000 | mani |
| Hñähñu | ote-000 | xi hñei |
| Hñähñu | ote-000 | xi hñembi |
| fiteny Malagasy | plt-000 | sàrotra |
| Impapura | qvi-000 | sinchi |
| Riff | rif-000 | qsəħ |
| Riff | rif-000 | wʕāʼ |
| Selice Romani | rmc-002 | pháro |
| română | ron-000 | dificil |
| română | ron-000 | greu |
| Saxa tyla | sah-001 | ɨaraχan |
| Кӣллт са̄мь кӣлл | sjd-000 | рэ̄ссесь |
| Saamáka | srm-000 | taánga |
| Kiswahili | swh-000 | -gumu |
| Takia | tbc-000 | mrwa- |
| ภาษาไทย | tha-000 | ยาก |
| phasa thai | tha-001 | yâak |
| Batsꞌi kꞌop | tzo-000 | vokol |
| tiếng Việt | vie-000 | khó |
| Yoem Noki | yaq-000 | obiachi |