| euskara | eus-000 |
| zail | |
| Afrikaans | afr-000 | moeilik |
| العربية | arb-000 | صعب |
| العربية | arb-000 | عسر |
| العربية | arb-000 | قاس |
| العربية | arb-000 | متشدد |
| luenga aragonesa | arg-000 | dificil |
| luenga aragonesa | arg-000 | difízil |
| PanLem | art-000 | dif |
| asturianu | ast-000 | difícil |
| Arabic-script Eastern Libyan Arabic | ayl-000 | واعر |
| boarisch | bar-000 | hoat |
| boarisch | bar-000 | håt |
| беларуская | bel-000 | цяжкі |
| বাংলা | ben-000 | কঠিন |
| bosanski | bos-000 | težak |
| brezhoneg | bre-000 | start |
| български | bul-000 | сложен |
| български | bul-000 | труден |
| bălgarski ezik | bul-001 | trúden |
| català | cat-000 | dificil |
| català | cat-000 | difícil |
| català | cat-000 | dur |
| Chamicuro | ccc-000 | yeewa |
| čeština | ces-000 | komplikovaný |
| čeština | ces-000 | obtížný |
| čeština | ces-000 | složitý |
| ѩзыкъ словѣньскъ | chu-000 | тѧжкъ |
| ѩзыкъ словѣньскъ | chu-000 | тѧжъкъ |
| slověnĭskŭ językŭ | chu-001 | tęžkŭ |
| 普通话 | cmn-000 | 复杂 |
| 普通话 | cmn-000 | 曲折 |
| 普通话 | cmn-000 | 疑难 |
| 普通话 | cmn-000 | 繁 |
| 普通话 | cmn-000 | 繁复 |
| 普通话 | cmn-000 | 艰难 |
| 普通话 | cmn-000 | 难 |
| 普通话 | cmn-000 | 难捱 |
| 國語 | cmn-001 | 困難的 |
| 國語 | cmn-001 | 曲折 |
| 國語 | cmn-001 | 疑難 |
| 國語 | cmn-001 | 繁 |
| 國語 | cmn-001 | 繁複 |
| 國語 | cmn-001 | 艱難 |
| 國語 | cmn-001 | 艱難的 |
| 國語 | cmn-001 | 複雜 |
| 國語 | cmn-001 | 難 |
| 國語 | cmn-001 | 難捱 |
| Hànyǔ | cmn-003 | fan |
| Hànyǔ | cmn-003 | fuza |
| Hànyǔ | cmn-003 | fán fu |
| Hànyǔ | cmn-003 | fùzá |
| Hànyǔ | cmn-003 | kunnan |
| Hànyǔ | cmn-003 | kùnnán |
| Hànyǔ | cmn-003 | nan |
| Hànyǔ | cmn-003 | nán ai |
| Hànyǔ | cmn-003 | qū zhe |
| Hànyǔ | cmn-003 | yí nan |
| Qırımtatar tili | crh-000 | qıyın |
| Qırımtatar tili | crh-000 | zor |
| Cymraeg | cym-000 | anodd |
| dansk | dan-000 | hård |
| dansk | dan-000 | svær |
| dansk | dan-000 | vanskeligt |
| Deutsch | deu-000 | diffizil |
| Deutsch | deu-000 | erschwert |
| Deutsch | deu-000 | kniffelig |
| Deutsch | deu-000 | knifflig |
| Deutsch | deu-000 | kompliziert |
| Deutsch | deu-000 | kompliziert gemacht |
| Deutsch | deu-000 | machte kompliziert |
| Deutsch | deu-000 | mühsam |
| Deutsch | deu-000 | schwer |
| Deutsch | deu-000 | schwererziehbar |
| Deutsch | deu-000 | schwierig |
| Deutsch | deu-000 | verkompliziert |
| Deutsch | deu-000 | verkomplizierte |
| Deutsch | deu-000 | vertrackt |
| Deutsch | deu-000 | verzwickt |
| eesti | ekk-000 | keeruline |
| ελληνικά | ell-000 | δίσκολος |
| ελληνικά | ell-000 | δύσκολος |
| ελληνικά | ell-000 | δύσκολος-η-ο |
| ελληνικά | ell-000 | περίπλοκος |
| ελληνικά | ell-000 | πολύπλοκος |
| ελληνικά | ell-000 | σκληρός |
| English | eng-000 | adamant |
| English | eng-000 | arduous |
| English | eng-000 | awkward |
| English | eng-000 | complicated |
| English | eng-000 | convoluted |
| English | eng-000 | delicate |
| English | eng-000 | difficult |
| English | eng-000 | dodgy |
| English | eng-000 | fancy-pants |
| English | eng-000 | hard |
| English | eng-000 | hard-working |
| English | eng-000 | implex |
| English | eng-000 | intricate |
| English | eng-000 | involute |
| English | eng-000 | involved |
| English | eng-000 | knotty |
| English | eng-000 | lean |
| English | eng-000 | nasty |
| English | eng-000 | obscure |
| English | eng-000 | outside |
| English | eng-000 | painful |
| English | eng-000 | problematical |
| English | eng-000 | rough |
| English | eng-000 | rugged |
| English | eng-000 | sensitive |
| English | eng-000 | stiff |
| English | eng-000 | tangled |
| English | eng-000 | taxing |
| English | eng-000 | testing |
| English | eng-000 | thorny |
| English | eng-000 | ticklish |
| English | eng-000 | tireless |
| English | eng-000 | touchy |
| English | eng-000 | tough |
| English | eng-000 | tricky |
| 𐐀𐑍𐑊𐐮𐑇 | eng-006 | 𐐼𐐮𐑁𐐮𐐿𐐲𐑊𐐻 |
| Australian English | eng-009 | difficult |
| New Zealand English | eng-010 | difficult |
| Esperanto | epo-000 | klopoda |
| Esperanto | epo-000 | komplika |
| Esperanto | epo-000 | komplikita |
| Esperanto | epo-000 | malfacila |
| Esperanto | epo-000 | malsimpla |
| euskara | eus-000 | arazoak dituen |
| euskara | eus-000 | bihurri |
| euskara | eus-000 | gaitz |
| euskara | eus-000 | gogor |
| euskara | eus-000 | kontuzko |
| euskara | eus-000 | korapilatsu |
| euskara | eus-000 | labain |
| euskara | eus-000 | nahasi |
| euskara | eus-000 | neketsu |
| euskara | eus-000 | nekez |
| euskara | eus-000 | problematiko |
| euskara | eus-000 | txiki |
| euskara | eus-000 | ulergaitz |
| føroyskt | fao-000 | illur |
| føroyskt | fao-000 | torførur |
| føroyskt | fao-000 | trupul |
| suomi | fin-000 | ankea |
| suomi | fin-000 | hankala |
| suomi | fin-000 | kimurantti |
| suomi | fin-000 | kinkkinen |
| suomi | fin-000 | monimutkainen |
| suomi | fin-000 | mutkikas |
| suomi | fin-000 | vaativa |
| suomi | fin-000 | vaikeus |
| séliš | fla-000 | tiltiligut |
| français | fra-000 | ardu |
| français | fra-000 | compliqua |
| français | fra-000 | compliquai |
| français | fra-000 | compliquâmes |
| français | fra-000 | compliquèrent |
| français | fra-000 | compliqué |
| français | fra-000 | compliquée |
| français | fra-000 | compliquées |
| français | fra-000 | compliqués |
| français | fra-000 | difficile |
| français | fra-000 | dur |
| français | fra-000 | délicat |
| français | fra-000 | malaise |
| français | fra-000 | malaisé |
| français | fra-000 | sévère |
| français | fra-000 | épineux |
| Frysk | fry-000 | slim |
| Gàidhlig | gla-000 | doirbh |
| Gàidhlig | gla-000 | mì-fhurasda |
| Gaeilge | gle-000 | cas |
| Gaeilge | gle-000 | casta |
| Gaeilge | gle-000 | deacair |
| galego | glg-000 | difícil |
| galego | glg-000 | duro |
| yn Ghaelg | glv-000 | trome |
| ἑλληνικὴ γλῶττα | grc-000 | ἄπορος |
| ગુજરાતી | guj-000 | કઠિન |
| kreyòl ayisyen | hat-000 | difisil |
| Српскохрватски | hbs-000 | тежак |
| Srpskohrvatski | hbs-001 | težak |
| עברית | heb-000 | מסובך |
| עברית | heb-000 | מסובכת |
| עברית | heb-000 | קשה |
| Hiligaynon | hil-000 | apinas |
| हिन्दी | hin-000 | कठिन |
| हिन्दी | hin-000 | मुशकिल |
| हिन्दी | hin-000 | मुश्किल |
| हिन्दी | hin-000 | विकट |
| hrvatski | hrv-000 | kompliciran |
| hrvatski | hrv-000 | kompliciranija |
| hrvatski | hrv-000 | složen |
| hrvatski | hrv-000 | složeno |
| hrvatski | hrv-000 | teško |
| hrvatski | hrv-000 | zapetljan |
| magyar | hun-000 | nehéz |
| արևելահայերեն | hye-000 | զոռ |
| Ido | ido-000 | desfacila |
| interlingua | ina-000 | ardue |
| interlingua | ina-000 | difficile |
| interlingua | ina-000 | intricate |
| bahasa Indonesia | ind-000 | mempersulit |
| bahasa Indonesia | ind-000 | sulit |
| íslenska | isl-000 | erfiður |
| íslenska | isl-000 | flókinn |
| íslenska | isl-000 | vandur |
| íslenska | isl-000 | þungur |
| italiano | ita-000 | arduo |
| italiano | ita-000 | complicato |
| italiano | ita-000 | difficile |
| italiano | ita-000 | difficoltosa |
| italiano | ita-000 | indaginoso |
| italiano | ita-000 | intricato |
| italiano | ita-000 | macchinoso |
| la lojban. | jbo-000 | nandu |
| 日本語 | jpn-000 | 困難 |
| 日本語 | jpn-000 | 大事な |
| 日本語 | jpn-000 | 複雑 |
| 日本語 | jpn-000 | 難しい |
| 日本語 | jpn-000 | 難解 |
| Nihongo | jpn-001 | konnan |
| にほんご | jpn-002 | こんなん |
| нихонго | jpn-153 | коннан |
| ქართული | kat-000 | ძნელი |
| Khasi | kha-000 | bashitom |
| كورمانجى | kmr-002 | زهحمهت |
| كورمانجى | kmr-002 | سهخت |
| 한국어 | kor-000 | 곤란한 |
| 한국어 | kor-000 | 다루기 힘든 |
| 한국어 | kor-000 | 어렵다 |
| 한국어 | kor-000 | 풀기어려운 |
| lietuvių | lit-000 | keblumas |
| lietuvių | lit-000 | komplikuotas |
| lietuvių | lit-000 | sudėtingas |
| lietuvių | lit-000 | sunkiai sukalbamas |
| lietuvių | lit-000 | sunkus |
| Lumbaart | lmo-006 | düür |
| latviešu | lvs-000 | grūts |
| latviešu | lvs-000 | komplicēts |
| latviešu | lvs-000 | sarežģīts |
| मराठी | mar-000 | कठिण |
| македонски | mkd-000 | тежок |
| македонски | mkd-000 | тешки |
| 台灣話 | nan-000 | ho̍k-cha̍p |
| 台灣話 | nan-000 | khùn-lân |
| 台灣話 | nan-000 | 困难 |
| 台灣話 | nan-000 | 困難 |
| 台灣話 | nan-000 | 复杂 |
| 台灣話 | nan-000 | 複雜 |
| napulitano | nap-000 | deffìcile |
| Nederlands | nld-000 | complex |
| Nederlands | nld-000 | difficiel |
| Nederlands | nld-000 | kwalijk |
| bokmål | nob-000 | komplisert |
| bokmål | nob-000 | uoversiktlig |
| bokmål | nob-000 | vanskelig |
| occitan | oci-000 | dificil |
| occitan | oci-000 | dur |
| occitan | oci-000 | malaisit |
| فارسی | pes-000 | دشوار |
| فارسی | pes-000 | سخت |
| lenga piemontèisa | pms-000 | mal fé |
| polski | pol-000 | skomplikowany |
| polski | pol-000 | trudna |
| polski | pol-000 | trudne |
| polski | pol-000 | trudny |
| polski | pol-000 | twardy |
| português | por-000 | afanoso |
| português | por-000 | complexo |
| português | por-000 | complicado |
| português | por-000 | dificultoso |
| português | por-000 | difícil |
| português brasileiro | por-001 | difícil |
| português europeu | por-002 | difícil |
| română | ron-000 | anevoios |
| română | ron-000 | complicat |
| română | ron-000 | dificil |
| română | ron-000 | difícil |
| română | ron-000 | greu |
| русский | rus-000 | непростой |
| русский | rus-000 | осложнен |
| русский | rus-000 | осложненный |
| русский | rus-000 | сложный |
| русский | rus-000 | трудный |
| संस्कृतम् | san-000 | अलभ्य |
| संस्कृतम् | san-000 | कष्ट |
| lingua siciliana | scn-000 | diffìcili |
| Scots leid | sco-000 | thrawn |
| slovenčina | slk-000 | drsný |
| slovenčina | slk-000 | komplikovaná |
| slovenčina | slk-000 | komplikované |
| slovenčina | slk-000 | neľahká |
| slovenčina | slk-000 | neľahké |
| slovenčina | slk-000 | neľahký |
| slovenčina | slk-000 | obtiažny |
| slovenčina | slk-000 | obťažné |
| slovenčina | slk-000 | spletitá |
| slovenčina | slk-000 | spletité |
| slovenčina | slk-000 | spletitý |
| slovenčina | slk-000 | tvrdý |
| slovenčina | slk-000 | zložitá |
| slovenčina | slk-000 | zložité |
| slovenčina | slk-000 | zložitý |
| slovenčina | slk-000 | ťažká |
| slovenčina | slk-000 | ťažké |
| slovenčina | slk-000 | ťažký |
| slovenščina | slv-000 | težek |
| davvisámegiella | sme-000 | mohkkái |
| davvisámegiella | sme-000 | váttis |
| español | spa-000 | chungo |
| español | spa-000 | compleja |
| español | spa-000 | complejo |
| español | spa-000 | complicado |
| español | spa-000 | difícil |
| español | spa-000 | duro |
| español | spa-000 | tenaz |
| shqip | sqi-000 | vështirë |
| sardu | srd-000 | difìtzile |
| српски | srp-000 | тежак |
| српски | srp-000 | тешко |
| srpski | srp-001 | teško |
| srpski | srp-001 | težak |
| Lengua de signos española | ssp-000 | ch.émacb |
| svenska | swe-000 | komplicerad |
| svenska | swe-000 | komplicerat |
| svenska | swe-000 | svår |
| Kiswahili | swh-000 | -gumu |
| татарча | tat-001 | дөшвар |
| తెలుగు | tel-000 | కఠినమైన |
| తెలుగు | tel-000 | కష్టమైన |
| తెలుగు | tel-000 | క్లిష్టమైన |
| Tagalog | tgl-000 | mahirap |
| ภาษาไทย | tha-000 | ซับซ้อน |
| ภาษาไทย | tha-000 | ดื้อรั้น |
| ภาษาไทย | tha-000 | มีอุปสรรค |
| ภาษาไทย | tha-000 | ยากที่จะวิเคราะห์ เข้าใจหรืออธิบาย |
| Türkçe | tur-000 | dallı budaklı |
| Türkçe | tur-000 | güç |
| Türkçe | tur-000 | karmaşık |
| Türkçe | tur-000 | komplike |
| Türkçe | tur-000 | çetrefilli |
| українська | ukr-000 | важкий |
| українська | ukr-000 | заплутаний |
| українська | ukr-000 | трудний |
| українська | ukr-000 | ускладнений |
| اردو | urd-000 | دشوار |
| اردو | urd-000 | مشکل |
| اردو | urd-000 | کٹھن |
| łéngua vèneta | vec-000 | difissile |
| tiếng Việt | vie-000 | khó |
| tiếng Việt | vie-000 | khó khăn |
| Wik-Mungkan | wim-000 | świrig |
| ייִדיש | ydd-000 | שווער |
| 廣東話 | yue-000 | 困難 |
| 廣東話 | yue-000 | 難 |