| English | eng-000 |
| challenging | |
| Afrikaans | afr-000 | arbeidsaam |
| Afrikaans | afr-000 | bedroewend |
| Afrikaans | afr-000 | seer |
| toskërishte | als-000 | duke sfiduar |
| Englisce sprǣc | ang-000 | sarlic |
| العربية | arb-000 | التحدّي |
| العربية | arb-000 | طعن |
| العربية | arb-000 | طعون |
| Universal Networking Language | art-253 | challenging(icl>adj) |
| Universal Networking Language | art-253 | challenging(icl>adj,equ>ambitious) |
| asturianu | ast-000 | desafiante |
| asturianu | ast-000 | griespu |
| Old Avestan | ave-001 | vyâxanem |
| বাংলা | ben-000 | প্রতিস্পর্ধী |
| български | bul-000 | неподчиняващ се |
| български | bul-000 | предизвикателен |
| Brithenig | bzt-000 | disffeddal |
| català | cat-000 | desafiador |
| català | cat-000 | desafiant |
| català | cat-000 | diligent |
| čeština | ces-000 | náročný |
| čeština | ces-000 | odvážný |
| čeština | ces-000 | vyzývající |
| čeština | ces-000 | vyzývavý |
| 普通话 | cmn-000 | 令人深思的 |
| 普通话 | cmn-000 | 令人鼓舞的 |
| 普通话 | cmn-000 | 使人思考的 |
| 普通话 | cmn-000 | 刺激的 |
| 普通话 | cmn-000 | 发人深思的 |
| 普通话 | cmn-000 | 复杂的 |
| 普通话 | cmn-000 | 大胆 |
| 普通话 | cmn-000 | 富于激发性的 |
| 普通话 | cmn-000 | 挑战兴趣的 |
| 普通话 | cmn-000 | 挑战性的 |
| 普通话 | cmn-000 | 挑拨的 |
| 國語 | cmn-001 | 具有挑戰性的 |
| 國語 | cmn-001 | 大膽 |
| 國語 | cmn-001 | 艱苦 |
| 國語 | cmn-001 | 艱難 |
| 國語 | cmn-001 | 辛苦 |
| Hànyǔ | cmn-003 | dadan |
| Hànyǔ | cmn-003 | dàdǎn |
| Cymraeg | cym-000 | heriol |
| dansk | dan-000 | flittig |
| dansk | dan-000 | smertelig |
| dansk | dan-000 | udfordrende |
| Najamba | dbu-000 | káŋ-gó |
| Najamba | dbu-000 | káŋgé |
| Najamba | dbu-000 | káŋgó |
| Najamba | dbu-000 | káŋɛ́: |
| tombo so | dbu-001 | káŋá |
| Walo | dbw-000 | pɛ̀mìrⁿê |
| Walo | dbw-000 | pɛ̀mìrⁿɛ̂ |
| Deutsch | deu-000 | Anruf |
| Deutsch | deu-000 | Postenanruf |
| Deutsch | deu-000 | Werda |
| Deutsch | deu-000 | anspruchsvoll |
| Deutsch | deu-000 | arbeitsam |
| Deutsch | deu-000 | aufsässig |
| Deutsch | deu-000 | beflissen |
| Deutsch | deu-000 | betrüblich |
| Deutsch | deu-000 | emsig |
| Deutsch | deu-000 | fleißig |
| Deutsch | deu-000 | geflissentlich |
| Deutsch | deu-000 | geschäftig |
| Deutsch | deu-000 | herausfordernd |
| Deutsch | deu-000 | schmerzhaft |
| Deutsch | deu-000 | schmerzlich |
| Deutsch | deu-000 | strebsam |
| Deutsch | deu-000 | trutzig |
| jàmsǎy | djm-000 | jiru |
| jàmsǎy | djm-000 | jíːrú |
| Gourou | djm-001 | zí:rú |
| Gourou | djm-001 | zíːrú |
| Tabi | djm-002 | lárà |
| Tabi | djm-002 | yɛ́ddà |
| Beni | djm-003 | là:râ: |
| Beni | djm-003 | làːrâː |
| Perge Tegu | djm-004 | gí:rì |
| Mombo | dmb-001 | kírímù |
| Dàn | dnj-001 | bhlɔɔsü |
| Togo-Kan | dtk-002 | jí:rí |
| Yorno-So | dts-001 | jí:rú |
| Yorno-So | dts-001 | kî:dɛ̀ |
| Dogon Toro Tegu—Tandam-Tabi-Irwa | dtt-000 | lárà |
| Dogon Toro Tegu—Tandam-Tabi-Irwa | dtt-000 | yɛ́ddà |
| yàndà-dòm | dym-000 | zí: |
| eesti | ekk-000 | väljakutset pakkuv |
| eesti | ekk-000 | väljakutsuv |
| English | eng-000 | Byzantine |
| English | eng-000 | absorbing |
| English | eng-000 | active |
| English | eng-000 | ambitious |
| English | eng-000 | arduous |
| English | eng-000 | asking a person’s identity |
| English | eng-000 | assiduous |
| English | eng-000 | awkward |
| English | eng-000 | bad |
| English | eng-000 | bitter |
| English | eng-000 | bleak |
| English | eng-000 | bloody-minded |
| English | eng-000 | bolshy |
| English | eng-000 | bothersome |
| English | eng-000 | bunglesome |
| English | eng-000 | calling |
| English | eng-000 | calling out |
| English | eng-000 | captivating |
| English | eng-000 | challenge |
| English | eng-000 | complex |
| English | eng-000 | contest |
| English | eng-000 | cumbersome |
| English | eng-000 | defiance |
| English | eng-000 | defiant |
| English | eng-000 | defy |
| English | eng-000 | demanding |
| English | eng-000 | depressing |
| English | eng-000 | difficult |
| English | eng-000 | diligent |
| English | eng-000 | dismal |
| English | eng-000 | dispute |
| English | eng-000 | distressing |
| English | eng-000 | effortful |
| English | eng-000 | exacting |
| English | eng-000 | exhausting |
| English | eng-000 | exigent |
| English | eng-000 | fastidious |
| English | eng-000 | formidable |
| English | eng-000 | fractious |
| English | eng-000 | grave |
| English | eng-000 | grievous |
| English | eng-000 | hard |
| English | eng-000 | hardship |
| English | eng-000 | hardworking |
| English | eng-000 | heavy |
| English | eng-000 | hot |
| English | eng-000 | hurtful |
| English | eng-000 | inconvenient |
| English | eng-000 | industrious |
| English | eng-000 | inopportune |
| English | eng-000 | intractable |
| English | eng-000 | intriguing |
| English | eng-000 | invoking |
| English | eng-000 | knotted |
| English | eng-000 | miserable |
| English | eng-000 | painful |
| English | eng-000 | piquant |
| English | eng-000 | saddening |
| English | eng-000 | serious |
| English | eng-000 | sesquipedalian |
| English | eng-000 | sophisticated |
| English | eng-000 | sore |
| English | eng-000 | summoning |
| English | eng-000 | taxing |
| English | eng-000 | thought-provoking |
| English | eng-000 | tough |
| English | eng-000 | tribulation |
| English | eng-000 | tricky |
| English | eng-000 | troublesome |
| English | eng-000 | troublous |
| English | eng-000 | unenviable |
| English | eng-000 | unfriendly |
| English | eng-000 | unmanageable |
| English | eng-000 | unpronounceable |
| English | eng-000 | unutterable |
| English | eng-000 | unwieldy |
| Esperanto | epo-000 | aflikta |
| Esperanto | epo-000 | defia |
| Esperanto | epo-000 | diligenta |
| Esperanto | epo-000 | dolora |
| Esperanto | epo-000 | laborema |
| Esperanto | epo-000 | malfacila |
| Esperanto | epo-000 | malfacile |
| Esperanto | epo-000 | malĝojiga |
| Esperanto | epo-000 | peniga |
| føroyskt | fao-000 | arbeiðssamur |
| føroyskt | fao-000 | hugagóður |
| føroyskt | fao-000 | íðin |
| suomi | fin-000 | ahkera |
| suomi | fin-000 | ajatuksia herättävä |
| suomi | fin-000 | haastava |
| suomi | fin-000 | haasteellinen |
| suomi | fin-000 | hankala |
| suomi | fin-000 | jännittävä |
| suomi | fin-000 | jäävätä |
| suomi | fin-000 | kiehtova |
| suomi | fin-000 | suurisuuntainen |
| suomi | fin-000 | uhitteleva |
| suomi | fin-000 | uhmainen |
| suomi | fin-000 | uhmaisa |
| suomi | fin-000 | uhmamielinen |
| suomi | fin-000 | vaativa |
| suomi | fin-000 | vaikea |
| français | fra-000 | ambitieux |
| français | fra-000 | contester |
| français | fra-000 | contredire |
| français | fra-000 | de défi |
| français | fra-000 | laborieux |
| français | fra-000 | provocant |
| français | fra-000 | provocateur |
| français | fra-000 | pénible |
| français | fra-000 | stimulant |
| Frysk | fry-000 | krigel |
| Frysk | fry-000 | pynlik |
| Frysk | fry-000 | warber |
| galego | glg-000 | desafiante |
| galego | glg-000 | esixente |
| yn Ghaelg | glv-000 | arganey |
| yn Ghaelg | glv-000 | cur forrane |
| yn Ghaelg | glv-000 | cur y lane |
| yn Ghaelg | glv-000 | doolaneagh |
| yn Ghaelg | glv-000 | doolaney |
| עברית | heb-000 | מאתגר |
| עברית | heb-000 | מאתגרת |
| hiMxI | hin-004 | nidara |
| hrvatski | hrv-000 | izazivajući |
| hrvatski | hrv-000 | izazovan |
| hrvatski | hrv-000 | izazovima |
| hrvatski | hrv-000 | koji je pun izazova |
| hrvatski | hrv-000 | nesuradljiv |
| hrvatski | hrv-000 | prkosan |
| magyar | hun-000 | dacos |
| magyar | hun-000 | erőpróbát jelentő |
| magyar | hun-000 | kihívó |
| magyar | hun-000 | reagálásra késztető |
| magyar | hun-000 | szorgalmas |
| magyar | hun-000 | állásfoglalásra késztető |
| magyar | hun-000 | érdeklődésre számot tartó |
| interlingua | ina-000 | stimulante |
| italiano | ita-000 | ambizioso |
| italiano | ita-000 | attivo |
| italiano | ita-000 | di sfida |
| italiano | ita-000 | doloroso |
| italiano | ita-000 | impegnativo |
| italiano | ita-000 | laborioso |
| italiano | ita-000 | provocatorio |
| 日本語 | jpn-000 | 挑戦的 |
| 日本語 | jpn-000 | 誰何 |
| Taqbaylit | kab-000 | asmentas |
| 한국어 | kor-000 | 도전적인 |
| 한국어 | kor-000 | 무시하는 |
| 한국어 | kor-000 | 순종하지 않는 |
| Lingua Franca Nova | lfn-000 | defiante |
| мокшень кяль | mdf-000 | серьгяди |
| mokshenj kalj | mdf-001 | serjgjadi |
| Maranao | mrw-000 | mapadal |
| эрзянь кель | myv-000 | пелькстыця |
| 台灣話 | nan-000 | tōa-táⁿ |
| 台灣話 | nan-000 | 大胆 |
| 台灣話 | nan-000 | 大膽 |
| Tâi-gí | nan-003 | kan- |
| Tâi-gí | nan-003 | kan-khó· |
| Tâi-gí | nan-003 | kan-lăn |
| Tâi-gí | nan-003 | sin-khó· |
| Nederlands | nld-000 | arbeidzaam |
| Nederlands | nld-000 | bedroevend |
| Nederlands | nld-000 | deerlijk |
| Nederlands | nld-000 | droef |
| Nederlands | nld-000 | droevig |
| Nederlands | nld-000 | ijverig |
| Nederlands | nld-000 | moeilijk |
| Nederlands | nld-000 | moeitevol |
| Nederlands | nld-000 | moeizaam |
| Nederlands | nld-000 | naarstig |
| Nederlands | nld-000 | nijver |
| Nederlands | nld-000 | ongewillig |
| Nederlands | nld-000 | opstandig |
| Nederlands | nld-000 | pijnlijk |
| Nederlands | nld-000 | rebels |
| Nederlands | nld-000 | smartelijk |
| Nederlands | nld-000 | tartend |
| Nederlands | nld-000 | treurig |
| Nederlands | nld-000 | triest |
| Nederlands | nld-000 | vlijtig |
| Nederlands | nld-000 | weerspanning |
| Nederlands | nld-000 | werkzaam |
| Nederlands | nld-000 | zeer |
| Nederlands | nld-000 | zuur |
| Nederlands | nld-000 | zwaar |
| bokmål | nob-000 | sturen |
| nàŋ-dàmá | nzz-000 | tɔ̀sɔ̀rɔ́ |
| nàŋ-dàmá | nzz-000 | tɔ̀sɔ̀rɔ̂ |
| occitan | oci-000 | penible |
| occitan | oci-000 | penós |
| Papiamentu | pap-000 | brio |
| Papiamentu | pap-000 | doloroso |
| فارسی | pes-000 | بلند همت |
| فارسی | pes-000 | جاه طلب |
| فارسی | pes-000 | مبارز طلبی |
| فارسی | pes-000 | نامجو |
| polski | pol-000 | ambitny |
| polski | pol-000 | pilny |
| polski | pol-000 | pracowity |
| polski | pol-000 | wyzywający |
| português | por-000 | aflitivo |
| português | por-000 | ambicioso |
| português | por-000 | aplicado |
| português | por-000 | assíduo |
| português | por-000 | complicado |
| português | por-000 | desafiador |
| português | por-000 | desafiante |
| português | por-000 | diligente |
| português | por-000 | doloroso |
| português | por-000 | esforçado |
| português | por-000 | instigante |
| português | por-000 | intrigante |
| português | por-000 | laborioso |
| português | por-000 | operoso |
| português | por-000 | trabalhador |
| română | ron-000 | harnic |
| română | ron-000 | sfidător |
| Lugungu | rub-000 | ku̱lemesya |
| Lugungu | rub-000 | kyakabi |
| Lugungu | rub-000 | kyatabbu |
| русский | rus-000 | болезненный |
| русский | rus-000 | возражение |
| русский | rus-000 | вызывающий |
| русский | rus-000 | испытывающий |
| русский | rus-000 | манящий |
| русский | rus-000 | многообещающий |
| русский | rus-000 | перспективный |
| русский | rus-000 | побудительный |
| русский | rus-000 | побуждающий |
| русский | rus-000 | сложный |
| русский | rus-000 | стимулирующий |
| русский | rus-000 | требующий напряжения |
| русский | rus-000 | требующий напряжения сил |
| русский | rus-000 | трудный |
| संस्कृतम् | san-000 | आहुतिः |
| संस्कृतम् | san-000 | समाह्वयः |
| संस्कृतम् | san-000 | हक्काहक्कः |
| संस्कृतम् | san-000 | हूतिः |
| संस्कृतम् | san-000 | ह्वायक |
| slovenčina | slk-000 | náročný |
| slovenčina | slk-000 | odvážny |
| slovenčina | slk-000 | priečny |
| slovenčina | slk-000 | vzdorovitý |
| español | spa-000 | activo |
| español | spa-000 | afligido |
| español | spa-000 | ambicioso |
| español | spa-000 | desafiando |
| español | spa-000 | desafiante |
| español | spa-000 | diligente |
| español | spa-000 | exigente |
| español | spa-000 | laborioso |
| español | spa-000 | provocador |
| español | spa-000 | retador |
| español | spa-000 | trabajador |
| svenska | swe-000 | arbetsam |
| svenska | swe-000 | pinsam |
| svenska | swe-000 | smärtsam |
| Tagalog | tgl-000 | masípag |
| ภาษาไทย | tha-000 | ซึ่ง ท้า |
| ภาษาไทย | tha-000 | ต่อต้าน |
| ภาษาไทย | tha-000 | ที่ท้าทายความสามารถ |
| ภาษาไทย | tha-000 | ท้าทาย |
| türkmençe | tuk-000 | kyn |
| türkmençe | tuk-000 | ýowuz |
| Türkçe | tur-000 | acıklı |
| Türkçe | tur-000 | ağrılı |
| Türkçe | tur-000 | karşı gelen |
| Türkçe | tur-000 | meydan okuyan |
| Türkçe | tur-000 | çalışkan |
| tiếng Việt | vie-000 | kích thích |
| èdè Yorùbá | yor-000 | tí npèníjàtí nfì jàlọ́ |
| Maaya Tʼaan | yua-000 | aalkab u man meyah |
| Maaya Tʼaan | yua-000 | seeb u meyah |
| Bahasa Malaysia | zsm-000 | giat |