| Gaeilge | gle-000 |
| crua | |
| Aguaruna | agr-000 | kaʼc̷u-ham |
| агъул чӀал | agx-001 | цІуппеф |
| ашwалӀи мицӀи | akv-000 | хъачІадабе |
| Тлянуб-Цегоб | akv-001 | хъачІедаб |
| Qawasqar | alc-000 | seweyep |
| toskërishte | als-000 | i ’gurtə |
| toskërishte | als-000 | štəng |
| Englisce sprǣc | ang-000 | heard |
| къIaваннаб мицци | ani-000 | беща |
| къIaваннаб мицци | ani-000 | къвакІун̅иб |
| Муни | ani-001 | къвакIунниви |
| аршаттен чIат | aqc-001 | тІангъдут |
| аршаттен чIат | aqc-001 | тІанкъдут |
| Angaité | aqt-000 | amihi |
| العربية | arb-000 | جامِد |
| العربية | arb-000 | صُلْب |
| العربية | arb-000 | قاسٍ |
| Mapudungun | arn-000 | yafɨ |
| Araona | aro-000 | tepe-tepe |
| LWT Code | art-257 | 15.74 |
| المغربية | ary-000 | قاصح |
| Waorani | auc-000 | tæ̃ẽbõ |
| авар мацӀ | ava-000 | къвакІараб |
| авар андалал | ava-001 | къартІараб |
| авар антсух | ava-002 | хъачІаб |
| авар батлух | ava-003 | хъачІа |
| авар гид | ava-004 | къванкІураб |
| авар карах | ava-005 | къвакІураб |
| авар кусур | ava-006 | къванкъураб |
| авар закатали | ava-007 | къанкІлаб |
| Old Avestan | ave-001 | xraoždwa- |
| Old Avestan | ave-001 | xruždra- |
| Aymara | aym-000 | čˀulʸḳʰi |
| Aymara | aym-000 | ḳʰulu |
| Ayoreo | ayo-000 | eeʼto-ge |
| Ayoreo | ayo-000 | eeʼto-i |
| Азәрбајҹан дили | azj-001 | бәрк |
| Азәрбајҹан дили | azj-001 | сәрт |
| терекеме | azj-003 | берк |
| Náhuat Zacapoaxtla | azz-000 | takʷawa-k |
| башҡорт теле | bak-000 | ҡаты |
| Будад мез | bdk-001 | имансуз |
| беларуская | bel-000 | цвёрды |
| Буйхaлъи мицIцIи | bph-000 | кьантІи |
| Буйхaлъи мицIцIи-Буйхaлъи | bph-001 | кьаптІи |
| brezhoneg | bre-000 | kaled |
| български | bul-000 | твърд |
| bălgarski ezik | bul-001 | tvə́rd |
| Nivaclé | cag-000 | c̷ˀuʔf-xi |
| Nivaclé | cag-000 | tˀun |
| Chácobo | cao-000 | koši |
| Chácobo | cao-000 | taro |
| Chipaya | cap-000 | tʰupi |
| Chimané | cas-000 | yæʼka |
| català | cat-000 | dur |
| Cavineña | cav-000 | pahi-da-ke |
| Cayapa | cbi-000 | ʼden-gih-tʸu-hu |
| Cayapa | cbi-000 | ʼpulu |
| Cashibo | cbr-000 | iru |
| Cashibo | cbr-000 | kɨrɨ |
| Chamicuro | ccc-000 | chmawa |
| 福州話 | cdo-001 | 硬 |
| čeština | ces-000 | tvrdý |
| Muisca | chb-000 | a-kam-ɨn maɣe |
| Muisca | chb-000 | acamen mague |
| нохчийн мотт | che-000 | морса |
| нохчийн мотт-Аккхий | che-001 | марс |
| Mari | chm-001 | ʼpeŋɣəðe |
| Mari | chm-001 | ʼpeškəðe |
| ᏣᎳᎩ ᎧᏬᏂᎯᏍᏗ | chr-000 | ᎠᏍᏓᏯ |
| slověnĭskŭ językŭ | chu-001 | tvrŭdŭ |
| slověnĭskŭ językŭ | chu-001 | žestokŭ |
| чамалалдуб мичӏчӏ | cji-000 | квас̅Іатуб |
| чамалалдуб мичӏчӏ | cji-000 | кьагъуб |
| чамалалдуб мичӏчӏ | cji-000 | хъачІуб |
| Embera | cmi-000 | zaʼrea |
| 普通话 | cmn-000 | 硬 |
| 國語 | cmn-001 | 硬 |
| Colorado | cof-000 | poʼlõ |
| Cofán | con-000 | taʔe |
| Cofán | con-000 | taʔec̷ʰi |
| Cofán | con-000 | taʔeʔo |
| Chorote | crt-000 | tosey |
| Cha7³¹ tinyan³ | ctz-000 | tla |
| Cayuvava | cyb-000 | kɨrɨ |
| Cayuvava | cyb-000 | pa-ʼkɨrɨ-ha |
| Cymraeg | cym-000 | caled |
| dansk | dan-000 | hård |
| дарган мез | dar-000 | кьяркьси |
| дарган мез | dar-000 | чІумаси |
| хайдакь | dar-001 | чІичІякай |
| гӀугъбуган | dar-002 | чІячІязиб |
| муира | dar-003 | чІумел |
| ицIари | dar-004 | белккунци |
| Negerhollands | dcr-000 | tai |
| цез мец | ddo-000 | хъІохъІору |
| сагадин | ddo-003 | хъІвохъІвору |
| Deutsch | deu-000 | fest |
| Deutsch | deu-000 | hart |
| Dalmatian | dlm-000 | doir |
| eesti | ekk-000 | kəwa |
| Ellinika | ell-003 | skli’ros |
| English | eng-000 | difficult |
| English | eng-000 | hard |
| English | eng-000 | harsh |
| English | eng-000 | tough |
| Englisch | enm-000 | hard |
| Lengua | enx-000 | kai-he |
| Esperanto | epo-000 | malmola |
| Ese Ejja | ese-000 | -kaʔa |
| Ese Ejja | ese-000 | kaxae |
| Huarayo | ese-001 | kia-kaʔa |
| 'eüṣkara | eus-002 | ’gogor |
| suomi | fin-000 | kova |
| suomi | fin-000 | kowa |
| suomi | fin-000 | luya |
| français | fra-000 | dur |
| lenghe furlane | fur-000 | dûr |
| гъибдилIи мицци | gdo-001 | бещаб |
| Ghulfan | ghl-000 | bʊr |
| гьинузас мец | gin-001 | ролІойу |
| Gàidhlig | gla-000 | cruaidh |
| Gaeilge | gle-000 | aimhréidh |
| Gaeilge | gle-000 | ainfhial |
| Gaeilge | gle-000 | anacair |
| Gaeilge | gle-000 | anróiteach |
| Gaeilge | gle-000 | bocht |
| Gaeilge | gle-000 | borb |
| Gaeilge | gle-000 | bras |
| Gaeilge | gle-000 | breithiúnach |
| Gaeilge | gle-000 | brácúil |
| Gaeilge | gle-000 | bríoch |
| Gaeilge | gle-000 | bríomhar |
| Gaeilge | gle-000 | buan |
| Gaeilge | gle-000 | cadránta |
| Gaeilge | gle-000 | callshaothach |
| Gaeilge | gle-000 | callóideach |
| Gaeilge | gle-000 | calma |
| Gaeilge | gle-000 | casta |
| Gaeilge | gle-000 | ceachartha |
| Gaeilge | gle-000 | ceapánta |
| Gaeilge | gle-000 | chomh buan le carraig |
| Gaeilge | gle-000 | chomh crua le cloch |
| Gaeilge | gle-000 | chomh crua le hiarann |
| Gaeilge | gle-000 | chomh dolúbtha le priocaire |
| Gaeilge | gle-000 | chomh láidir le capall |
| Gaeilge | gle-000 | chomh láidir le gearrán |
| Gaeilge | gle-000 | chomh láidir le tarbh |
| Gaeilge | gle-000 | chomh láidir leis na daracha |
| Gaeilge | gle-000 | cinnte |
| Gaeilge | gle-000 | ciotach |
| Gaeilge | gle-000 | cnagach |
| Gaeilge | gle-000 | cranrach |
| Gaeilge | gle-000 | cranraithe |
| Gaeilge | gle-000 | creagánta |
| Gaeilge | gle-000 | crosta |
| Gaeilge | gle-000 | cruachroíoch |
| Gaeilge | gle-000 | cruaite |
| Gaeilge | gle-000 | cruálach |
| Gaeilge | gle-000 | cuisleach |
| Gaeilge | gle-000 | cuisneach |
| Gaeilge | gle-000 | cumasach |
| Gaeilge | gle-000 | daingean |
| Gaeilge | gle-000 | dalba |
| Gaeilge | gle-000 | danartha |
| Gaeilge | gle-000 | daoithiúil |
| Gaeilge | gle-000 | daor |
| Gaeilge | gle-000 | deacair |
| Gaeilge | gle-000 | deacair a shásamh |
| Gaeilge | gle-000 | deacrach |
| Gaeilge | gle-000 | dian |
| Gaeilge | gle-000 | diongbháilte |
| Gaeilge | gle-000 | dlúth |
| Gaeilge | gle-000 | docht |
| Gaeilge | gle-000 | dodhéanta |
| Gaeilge | gle-000 | doghrainneach |
| Gaeilge | gle-000 | doicheallach |
| Gaeilge | gle-000 | doiciúil |
| Gaeilge | gle-000 | doiligh |
| Gaeilge | gle-000 | doirbh |
| Gaeilge | gle-000 | dolúbtha |
| Gaeilge | gle-000 | donn |
| Gaeilge | gle-000 | dorrga |
| Gaeilge | gle-000 | doscúch |
| Gaeilge | gle-000 | droibhéalach |
| Gaeilge | gle-000 | duaisiúil |
| Gaeilge | gle-000 | duamhar |
| Gaeilge | gle-000 | dígeanta |
| Gaeilge | gle-000 | dílis |
| Gaeilge | gle-000 | díoghainn |
| Gaeilge | gle-000 | dócúlach |
| Gaeilge | gle-000 | dóite |
| Gaeilge | gle-000 | dóiteach |
| Gaeilge | gle-000 | dólámhach |
| Gaeilge | gle-000 | dúshlánach |
| Gaeilge | gle-000 | easonórach |
| Gaeilge | gle-000 | fadharcánach |
| Gaeilge | gle-000 | fadhbach |
| Gaeilge | gle-000 | feidhmiúil |
| Gaeilge | gle-000 | feilmeanta |
| Gaeilge | gle-000 | foirtil |
| Gaeilge | gle-000 | folcanta |
| Gaeilge | gle-000 | frithir |
| Gaeilge | gle-000 | fuarchroíoch |
| Gaeilge | gle-000 | fuinniúil |
| Gaeilge | gle-000 | fáiscthe |
| Gaeilge | gle-000 | fódúil |
| Gaeilge | gle-000 | fórsúil |
| Gaeilge | gle-000 | gairgeach |
| Gaeilge | gle-000 | gan anam |
| Gaeilge | gle-000 | gan bhaisteadh |
| Gaeilge | gle-000 | gan taise gan trócaire |
| Gaeilge | gle-000 | gann |
| Gaeilge | gle-000 | gannchúiseach |
| Gaeilge | gle-000 | gar |
| Gaeilge | gle-000 | garg |
| Gaeilge | gle-000 | go treis |
| Gaeilge | gle-000 | gortach |
| Gaeilge | gle-000 | groí |
| Gaeilge | gle-000 | géar |
| Gaeilge | gle-000 | iomardúil |
| Gaeilge | gle-000 | lom |
| Gaeilge | gle-000 | láidir |
| Gaeilge | gle-000 | léidmheach |
| Gaeilge | gle-000 | mascalach |
| Gaeilge | gle-000 | maslach |
| Gaeilge | gle-000 | miotalach |
| Gaeilge | gle-000 | míghnaíúil |
| Gaeilge | gle-000 | mínádúrtha |
| Gaeilge | gle-000 | mór |
| Gaeilge | gle-000 | neamhfhiúntach |
| Gaeilge | gle-000 | neartmhar |
| Gaeilge | gle-000 | nimhneach |
| Gaeilge | gle-000 | oscartha |
| Gaeilge | gle-000 | patuar |
| Gaeilge | gle-000 | polltach |
| Gaeilge | gle-000 | righin |
| Gaeilge | gle-000 | righnithe |
| Gaeilge | gle-000 | saothrach |
| Gaeilge | gle-000 | sclábhúil |
| Gaeilge | gle-000 | scolbánta |
| Gaeilge | gle-000 | searbh |
| Gaeilge | gle-000 | sioctha |
| Gaeilge | gle-000 | siocánta |
| Gaeilge | gle-000 | snaománach |
| Gaeilge | gle-000 | sonnda |
| Gaeilge | gle-000 | spartach |
| Gaeilge | gle-000 | sprionlaithe |
| Gaeilge | gle-000 | storrúil |
| Gaeilge | gle-000 | stuifeáilte |
| Gaeilge | gle-000 | stuifiúil |
| Gaeilge | gle-000 | stálaithe |
| Gaeilge | gle-000 | stóinseach |
| Gaeilge | gle-000 | stóinsithe |
| Gaeilge | gle-000 | suarach |
| Gaeilge | gle-000 | substainteach |
| Gaeilge | gle-000 | tacúil |
| Gaeilge | gle-000 | tailc |
| Gaeilge | gle-000 | talcánta |
| Gaeilge | gle-000 | talmhaí |
| Gaeilge | gle-000 | taosmhar |
| Gaeilge | gle-000 | tathagach |
| Gaeilge | gle-000 | teann |
| Gaeilge | gle-000 | tiarálach |
| Gaeilge | gle-000 | treabhar |
| Gaeilge | gle-000 | treampánach |
| Gaeilge | gle-000 | treisiúil |
| Gaeilge | gle-000 | treorach |
| Gaeilge | gle-000 | trom |
| Gaeilge | gle-000 | tréamanta |
| Gaeilge | gle-000 | tréan |
| Gaeilge | gle-000 | táite |
| Gaeilge | gle-000 | urrúnta |
| Gaeilge | gle-000 | urrúsach |
| Gaeilge | gle-000 | éadláith |
| Gaeilge | gle-000 | éilitheach |
| yn Ghaelg | glv-000 | creoi |
| diutsch | gmh-000 | hart |
| diutsch | gmh-000 | herte |
| diutisk | goh-000 | arandi |
| diutisk | goh-000 | gi-dwungan |
| diutisk | goh-000 | hanteg |
| diutisk | goh-000 | hart |
| diutisk | goh-000 | herti |
| diutisk | goh-000 | sarf |
| diutisk | goh-000 | scarp |
| diutisk | goh-000 | un-gi-mah |
| Gutiska razda | got-002 | hardus |
| Hellēnikḗ | grc-001 | sklē’ros |
| wayuunaiki | guc-000 | čečesɨ |
| avañeʼẽ | gug-000 | hatã |
| Chiriguano | gui-000 | t-ãta |
| Aché | guq-000 | krere |
| Hausa | hau-000 | tauri |
| ʻōlelo Hawaiʻi | haw-000 | paʔa |
| ʻōlelo Hawaiʻi | haw-000 | ʔoʔoleʔa |
| Српскохрватски | hbs-000 | тврд |
| Srpskohrvatski | hbs-001 | tvrd |
| हिन्दी | hin-000 | कठोर |
| हिन्दी | hin-000 | कड़ा |
| हिन्दी | hin-000 | सख़्त |
| nešili | hit-000 | dassu- |
| magyar | hun-000 | kemény |
| гьонкьос мыц | huz-001 | рылІеру |
| արևելահայերեն | hye-000 | կարծր |
| արևելահայերեն | hye-000 | պինդ |
| arevelahayeren | hye-002 | kˀarc̷ˀr |
| arevelahayeren | hye-002 | pˀind |
| hyw-001 | bint | |
| hyw-001 | gard͜zr | |
| Ido | ido-000 | harda |
| Ignaciano | ign-000 | ičakeru |
| Ignaciano | ign-000 | ʼčakeru |
| interlingua | ina-000 | dur |
| íslenska | isl-000 | hart |
| íslenska | isl-000 | harður |
| íslenska | isl-000 | hörð |
| Istriot | ist-000 | doûro |
| italiano | ita-000 | duro |
| Itonama | ito-000 | wɨkˀɨʔna |
| Itonama | ito-000 | čˀalɨʔna |
| Patwa | jam-000 | ād |
| 日本語 | jpn-000 | 硬い |
| бежкьа миц | kap-000 | хъаьчІчІоь |
| ქართული | kat-000 | მაგარი |
| ქართული | kat-000 | მყარი |
| Catuquina | kav-000 | yowɨ |
| Khanty | kca-017 | susum |
| Khanty | kca-017 | tak |
| Kaingáng | kgp-000 | tar |
| хварши | khv-002 | хъохъору лейлІу |
| инховари | khv-003 | лилълъу |
| инховари | khv-003 | луллъу |
| инховари | khv-003 | хъохъору |
| каьтш мицI | kjj-001 | кІаьвви |
| كورمانجى | kmr-002 | قایم |
| КIкIирлIи мацIцIи | kpt-002 | къваᴴкІоб |
| токитин | kpt-003 | къванкІилуб |
| Komi | kpv-001 | čor̃ɩd |
| къумукъ тил | kum-000 | бек гючлю |
| къумукъ тил | kum-000 | къатты |
| Kunza | kuz-000 | tarar |
| Kunza | kuz-000 | tta-rar |
| багвалинский язык | kva-001 | къакъатІуб |
| Karuk | kyh-000 | sákrīβ |
| latine | lat-000 | dūrus |
| лакку маз | lbe-000 | кьянкьасса |
| лезги чӀал | lez-000 | кІеви |
| лезги чӀал-Микрах | lez-001 | векъи |
| куба | lez-004 | кІеви |
| Limburgs | lim-000 | helle |
| lietuvių | lit-000 | kieta |
| lietuvių | lit-000 | kietas |
| lietuvių | lit-000 | kíetas |
| latviešu | lvs-000 | ciets |
| Macushi | mbc-000 | saʔme |
| Maca | mca-000 | tˀun |
| македонски | mkd-000 | тврд |
| македонски | mkd-000 | цврст |
| Malti | mlt-000 | iebes |
| Mansi | mns-007 | sosum |
| Mansi | mns-007 | tak |
| Mocoví | moc-000 | r-aʔɲi |
| reo Māori | mri-000 | maaroo |
| reo Māori | mri-000 | pakari |
| reo Māori | mri-000 | pakeke |
| reo Māori | mri-000 | tuapaka |
| reo Māori | mri-000 | tūmārō |
| Wichí | mtp-000 | tˀen |
| မြန်မာဘာသာ | mya-000 | မာ |
| Mundurukú | myu-000 | iča |
| Mundurukú | myu-000 | yača |
| erzänj kelj | myv-001 | kalgodo |
| Movima | mzp-000 | ɗin̉-ra |
| Nederlands | nld-000 | hard |
| bokmål | nob-000 | hard |
| ногай тили | nog-000 | айавсыз |
| ногай тили | nog-000 | каты |
| norskr | non-000 | harðr |
| Arāmît | oar-000 | taḳḳīp |
| Arāmît | oar-000 | ḳšē |
| Selknam | ona-000 | ʔoč eče |
| Wayampi | oym-000 | ãtã |
| Páez | pbb-000 | wexʸ |
| Panare | pbh-000 | karatah-pe |
| پښتو ژبه | pbu-000 | کلک |
| فارسی | pes-000 | سفت |
| فارسی | pes-000 | صلب |
| فارسی | pes-000 | مقاوم |
| فارسی | pes-000 | پایدار |
| Farsi | pes-002 | seft |
| Pilagá | plg-000 | d-ʔaɲi |
| Polci | plj-000 | nyaɓi |
| Reo Pa‘umotu | pmt-000 | kao |
| polski | pol-000 | twardy |
| português | por-000 | duro |
| Gününa Küne | pue-000 | kalc̷ɨ |
| Puinave | pui-000 | -sãt |
| Qusqu qhichwa simi | quz-000 | rumi |
| Rapanui | rap-000 | haʔrára-rára |
| Rapanui | rap-000 | hio-hio |
| Rapanui | rap-000 | hío-hío |
| Rapanui | rap-000 | iho-iho |
| Rapanui | rap-000 | oko |
| Rapanui | rap-000 | paári |
| lingua rumantscha | roh-000 | deir |
| lingua rumantscha | roh-000 | dir |
| lingua rumantscha | roh-000 | dür |
| Romani čhib | rom-000 | zuralo |
| română | ron-000 | dur |
| română | ron-000 | tare |
| Rotuman | rtm-000 | mou-mou |
| русский | rus-000 | жесткий |
| русский | rus-000 | кре́пкий |
| русский | rus-000 | про́чный |
| русский | rus-000 | суровый |
| русский | rus-000 | твёрдый |
| русский | rus-000 | трудный |
| русский | rus-000 | тяжелый |
| мыхIабишды чIел | rut-001 | чІиткІыд |
| saṃskṛtam | san-001 | dṛḍha- |
| lingua siciliana | scn-000 | duru |
| cmiique | sei-000 | -aiskan |
| šöľqumyt әty | sel-001 | talɨḳɨlʸ |
| Goídelc | sga-000 | calad |
| Goídelc | sga-000 | crūaid |
| Shirishana | shb-000 | kohipi |
| Shirishana | shb-000 | lothotho |
| Shipibo-Conibo | shp-000 | čoriš |
| Epena | sja-000 | čaaʼree |
| slovenčina | slk-000 | tvrdý |
| slovenščina | slv-000 | tŕd |
| davvisámegiella | sme-000 | gɑr̃ɑs |
| Siona | snn-000 | hɨha |
| español | spa-000 | duro |
| Enlhet | spn-000 | akyemnaʔteem |
| Enlhet | spn-000 | kayheʔ |
| Enlhet | spn-000 | taex |
| shqip | sqi-000 | fortë |
| sardu | srd-000 | duru |
| Sirionó | srq-000 | eači |
| Sirionó | srq-000 | ei̯ma |
| Sirionó | srq-000 | eãtã |
| svenska | swe-000 | hård |
| Kiswahili | swh-000 | ngumu |
| табасаран чӀал | tab-000 | ижмиб |
| ханаг | tab-002 | яржумув |
| Tehuelche | teh-000 | kʼšor |
| తెలుగు | tel-000 | గట్టి |
| ภาษาไทย | tha-000 | แข็ง |
| идараб мицци | tin-001 | чамхІалаб |
| цӀаӀхна миз | tkr-001 | утІумын |
| Toba | tmf-001 | da-ʔai-lek |
| Toba | tmf-001 | ḳadamt-a |
| Tacana | tna-000 | tadada |
| lea fakatonga | ton-000 | fefeka |
| Trumai | tpy-000 | ataxa |
| Trumai | tpy-000 | taxa |
| Trinitario | trn-000 | mraka |
| Trinitario | trn-000 | ʼʔčoɣeru |
| тати | ttt-000 | сəхд |
| Tuyuca | tue-000 | baʼyi |
| Türkçe | tur-000 | sert |
| kuśiññe | txb-000 | ścīre |
| удин муз | udi-001 | туьнд |
| udmurt kyl | udm-001 | c̷ʸur̃ɩt |
| українська | ukr-000 | тве́рдий |
| اردو | urd-000 | سخت |
| اردو | urd-000 | کٹھور |
| اردو | urd-000 | کڑا |
| łéngua vèneta | vec-000 | dur |
| łéngua vèneta | vec-000 | duro |
| tiếng Việt | vie-000 | cứng |
| tiếng Việt | vie-000 | rắn |
| Wapishana | wap-000 | dadara |
| Waurá | wau-000 | kehežuka |
| Wai Wai | waw-000 | čeyΦu |
| Yanomámi | wca-000 | hihu-wə |
| Yanomámi | wca-000 | yɨɨ-wə |
| lingaedje walon | wln-000 | deur |
| lingaedje walon | wln-000 | deure |
| Tokharian A | xto-000 | tsär |
| Yaminahua | yaa-000 | kɨrɨṣ̌ |
| Yagua | yad-000 | hakuway |
| Yagua | yad-000 | kuway- |
| Yagua | yad-000 | sura- |
| Yaruro | yae-000 | čʰua |
| Yámana | yag-000 | apeili |
| Yuwana | yau-000 | ikʸaka |
| yidish | ydd-001 | hart |
| nyenetsyaʼ vada | yrk-001 | toyenana |
| Yavitero | yvt-000 | ľ̥eni-hi |
| Shiwiʼma | zun-000 | ɬoʔo- |