| interlingua | ina-000 |
| ardue | |
| العربية | arb-000 | صعب |
| العربية | arb-000 | عسر |
| العربية | arb-000 | قاس |
| Romániço | art-013 | ardua |
| dansk | dan-000 | hård |
| dansk | dan-000 | svær |
| Deutsch | deu-000 | beschwerlich |
| Deutsch | deu-000 | haarig |
| Deutsch | deu-000 | mühsam |
| Deutsch | deu-000 | schwer |
| Deutsch | deu-000 | schwierig |
| ελληνικά | ell-000 | δύσκολος |
| English | eng-000 | arduous |
| English | eng-000 | bothersome |
| English | eng-000 | burdensome |
| English | eng-000 | difficult |
| English | eng-000 | onerous |
| English | eng-000 | steep |
| English | eng-000 | strenuous |
| English | eng-000 | toilsome |
| English | eng-000 | troublesome |
| English | eng-000 | uphill |
| Esperanto | epo-000 | laboriga |
| Esperanto | epo-000 | malfacila |
| Esperanto | epo-000 | peniga |
| euskara | eus-000 | nekez |
| euskara | eus-000 | zail |
| suomi | fin-000 | ankea |
| suomi | fin-000 | hankala |
| français | fra-000 | ardu |
| français | fra-000 | difficile |
| français | fra-000 | pénible |
| Ido | ido-000 | ardua |
| interlingua | ina-000 | difficile |
| interlingua | ina-000 | onerose |
| interlingua | ina-000 | penose |
| interlingua | ina-000 | precipitose |
| interlingua | ina-000 | scarpate |
| íslenska | isl-000 | erfiður |
| italiano | ita-000 | arduo |
| italiano | ita-000 | difficile |
| italiano | ita-000 | faticoso |
| italiano | ita-000 | laborioso |
| italiano | ita-000 | malagevole |
| italiano | ita-000 | scabroso |
| 日本語 | jpn-000 | 難しい |
| lietuvių | lit-000 | sunkus |
| bokmål | nob-000 | vanskelig |
| polski | pol-000 | trudny |
| polski | pol-000 | uciążliwy |
| português | por-000 | árduo |
| русский | rus-000 | крутой |
| русский | rus-000 | недоступный |
| русский | rus-000 | непростой |
| русский | rus-000 | обременительный |
| русский | rus-000 | сложный |
| русский | rus-000 | труд |
| русский | rus-000 | трудный |
| संस्कृतम् | san-000 | कष्ट |
| slovenčina | slk-000 | ťažký |
| español | spa-000 | arduo |
| español | spa-000 | difícil |
| español | spa-000 | embarazoso |
| español | spa-000 | molesto |
| español | spa-000 | pesado |
| svenska | swe-000 | besvärlig |
| svenska | swe-000 | svår |
| Wik-Mungkan | wim-000 | świrig |
| ייִדיש | ydd-000 | שווער |