- 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)
- 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)
- 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)
- 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) (Peru)
- 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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