- Afrikaans:moeilik
- Albanian:i vështirë (sq)
- Amharic:አስቸጋሪ(ʾäsčägari)
- Arabic:صَعْب(ṣaʕb)
- Moroccan Arabic:واعر(waʕr)
- Armenian:դժվար (hy)(džvar),բարդ (hy)(bard),ծանր (hy)(canr)
- Assamese:টান(tan)
- Asturian:difícil (ast)
- Azerbaijani:çətin (az),düşvar
- Bashkir:ҡыйын(qıyın),ауыр(awır)
- Basque:nekez (eu),zail
- Belarusian:ця́жкі (be)(cjážki),тру́дны(trúdny)
- Bengali:কঠিন (bn)(koṭhin)
- Bikol Central:
- Bikol Legazpi:dipisil (bcl)
- Bikol Naga:masakit
- Breton:diaes (br)
- Brunei Malay:payah
- Bulgarian:тру́ден (bg)(trúden),мъ́чен (bg)(mǎ́čen),те́жък (bg)(téžǎk)
- Burmese:ခဲယဉ်း (my)(hkai:yany:),ခက် (my)(hkak)
- Catalan:difícil (ca)
- Cebuano:lisud
- Chamicuro:yeewa
- Chechen:хала(xala)
- Cherokee:ᎤᏦᏍᏗ(utsosdi),ᏍᏓᏯ(sdaya)
- Chinese:
- Cantonese:難 /难(naan4),困難 /困难(kwan3 naan4)
- Mandarin:難 /难 (zh)(nán),困難 /困难 (zh)(kùnnán),艱難 /艰难 (zh)(jiānnán)
- Wu:難 /难
- Chukchi:аӈъачеты(aṇʺačety)
- Crimean Tatar:qıyın
- Czech:obtížný (cs),těžký (cs)
- Danish:vanskelig
- Dhivehi:please add this translation if you can
- Dutch:moeilijk (nl)
- Egyptian: (qsn)
- Esperanto:malfacila
- Estonian:keeruline (et)
- Ewe:sẽ̌
- Faroese:torførur
- Finnish:vaikea (fi),hankala (fi)
- French:difficile (fr)
- Galician:difícil (gl),arrevesado
- Georgian:ძნელი(ʒneli),რთული(rtuli),მძიმე (ka)(mʒime)
- German:schwer (de),schwierig (de)
- Gothic:𐌰𐌲𐌻𐌿𐍃(aglus)
- Greek:δύσκολος (el)(dýskolos)
- Ancient:χαλεπός(khalepós),δυσχερής(duskherḗs)
- Greenlandic:sapernarpoq
- Gujarati:કઠિન(kaṭhin)
- Haitian Creole:difisil
- Hebrew:קָשֶׁה (he)(kashé),מסובך(mesubbakh)
- Hindi:कठिन (hi)(kaṭhin),विकट (hi)(vikaṭ),मुश्किल (hi)(muśkil),दुश्वार (hi)(duśvār),दूभर (hi)(dūbhar)
- Hungarian:nehéz (hu)
- Icelandic:erfiður (is)
- Ido:desfacila (io)
- Ilocano:narigat
- Indonesian:sukar (id),susah (id),sulit (id)
- Ingush:хала(xala)
- Interlingua:difficile
- Irish:deacair
- Old Irish:ansae
- Italian:difficile (it)
- Japanese:難しい (ja)(むずかしい, muzukashii),困難な (ja)(こんなんな, konnan na)
- Jeju:어렵다(eoryeopda),심들다(simdeulda)
- Kabuverdianu:puxadu,pexóde,rabés
- Kannada:ಕಟ್ (kn)(kaṭ)
- Kazakh:қиын (kk)(qiyn),ауыр(auyr)
- Khiamniungan Naga:tshīk
- Khmer:ពិបាក (km)(pi’baak),យ៉ាប់ (km)(yap)
- Korean:어렵다 (ko)(eoryeopda),힘들다 (ko)(himdeulda)
- Kurdish:
- Central Kurdish:زەحمەت(zeḧmet),گران(gran),سەخت(sext)
- Kyrgyz:кыйын (ky)(kıyın),оор (ky)(oor)
- Ladino:difísil,zor
- Lao:ຍາກ(nyāk)
- Latin:difficilis (la)
- Latvian:sarežģīts,grūts
- Lithuanian:sunkus (lt)
- Macedonian:тежок(težok),мачен(mačen)
- Malay:sukar (ms),susah (ms)
- Maltese:diffiċli (mt)
- Manx:doillee,creoi,trome,mooar,neuaashagh
- Maori:whēuaua,uaua,taumaha hārukiruki(in the extreme)
- Marathi:अवघड(avghaḍ),कठीण(kaṭhīṇ)
- Mirandese:defícel
- Mon:ဝါတ် (mnw)(wāt)
- Mongolian:хэцүү (mn)(xecüü),хүнд (mn)(xünd),бэрх (mn)(berx),хүчир (mn)(xüčir)
- Navajo:nantłʼah
- Northern Sami:váttis
- Norwegian:vanskelig (no)
- Occitan:malaisit (oc),dificil (oc) m
- Odia:please add this translation if you can
- Old Church Slavonic:
- Cyrillic:тѩжькъ(tjęžĭkŭ)
- Old English:earfoþe
- Ottoman Turkish:دشوار(düşvâr)
- Pashto:ګران m(grân),مشکل m(muškil)
- Persian:دشوار (fa)(došvâr),مشکل (fa)(moškel),سخت (fa)(saxt),صعب (fa)(sa'b)
- Polish:trudny (pl),ciężki (pl)
- Portuguese:difícil (pt)
- Punjabi:ਕਠਿਨ(kaṭhin)
- Quechua:sasa
- Romanian:greu (ro),dificil (ro),anevoios (ro),complicat (ro)
- Russian:тру́дный (ru) m(trúdnyj),тяжёлый (ru)(tjažólyj),тя́жкий (ru)(tjážkij),сло́жный (ru)(slóžnyj)
- Samoan:faigatā
- Sanskrit:कठिन (sa)(kaṭhina)
- Scottish Gaelic:doirbh,mì-fhurasda,cruaidh,trom,duilich
- Serbo-Croatian:
- Cyrillic:тежак
- Roman:težak (sh)
- Sinhalese:අමාරු(amāru)
- Slovak:obtiažny,ťažký
- Slovene:težek (sl)
- Sorbian:
- Upper Sorbian:ćežki
- Spanish:difícil (es),tranca (es) ,chungo (es)
- Swedish:svår (sv)
- Tagalog:mahirap
- Tahitian:fifi
- Tajik:мушкил (tg)(muškil),душвор(dušvor),сахт (tg)(saxt)
- Tamil:கடினமான (ta)(kaṭiṉamāṉa)
- Tatar:кыен(qıyen),авыр (tt)(awır)
- Telugu:కఠినమైన (te)(kaṭhinamaina),కష్టమైన (te)(kaṣṭamaina)
- Tetum:susar
- Thai:ยาก (th)(yâak),ลำบาก (th)(lam-bàak)
- Tibetan:ཁག་པོ(khag po),དཀའ་ལས་ཁག་པོ(dka' las khag po),དཀའ་མོ(dka' mo),དཀའ་ངལ་ཅན(dka' ngal can)
- Tocharian B:waimene,āmāskai
- Tongan:faingataʻa
- Turkish:zor (tr),güç (tr),müşkül (tr),çetin (tr),kıyın (tr),düşvar,ağır (tr)
- Turkmen:çatak,çetin,kyn,müçgil
- Tày:cáo quán
- Ukrainian:важки́й (uk)(važkýj),трудни́й(trudnýj)
- Urdu:مشکل(muśkil),دشوار(duśvār),کٹھن(kaṭhin)
- Uyghur:قىيىن(qiyin),مۈشكۈل(müshkül)
- Uzbek:qiyin (uz),mushkul (uz),murakkab (uz)
- Vietnamese:khó (vi),khó khăn (vi)
- Volapük:fikulik (vo)
- Walloon:please add this translation if you can
- Welsh:anodd (cy),caled (cy)
- West Frisian:swier (fy)
- White Hmong:please add this translation if you can
- Yiddish:שווער(shver),האַרב(harb)
- Yoruba:le
- Zhuang:please add this translation if you can
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