- Albanian: paligjshme
- Arabic: غَيْر قَانُونِيٍّ (ḡayr qānūniyyin)
- Armenian: ապօրինի (hy) (apōrini), անօրինական (hy) (anōrinakan)
- Assamese: চোৰাং (süraṅ), আইন বিৰোধী (ain birüdhi), অবৈধ (oboidh), বেআইনী (beaini)
- Asturian: illegal
- Azerbaijani: qanunsuz (az), qeyri-qanuni (az), qeyri-leqal
- Belarusian: незако́нны (njezakónny), нелега́льны (njeljehálʹny)
- Bulgarian: незаконен (bg) (nezakonen), нелегален (bg) (nelegalen)
- Catalan: il·legal (ca)
- Chinese:
- Mandarin: 非法的 (zh) (fēifǎ de), 不合法的 (zh) (bùhéfǎ de), 不法的 (zh) (bùfǎ de)
- Czech: ilegální (cs), nezákonný (cs)
- Dutch: strafbaar (nl), illegaal (nl), onwettig (nl)
- Esperanto: kontraŭleĝa
- Estonian: ebaseaduslik, illegaalne, seadusvastane
- Finnish: laiton (fi), lainvastainen (fi)
- French: illégal (fr)
- Galician: ilícito (gl), ilegal (gl)
- Georgian: უკანონო (uḳanono), არაკანონიერი (araḳanonieri), არალეგალური (aralegaluri), კანონსაწინააღმდეგო (ḳanonsac̣inaaɣmdego), აკრძალული (aḳrʒaluli)
- German: illegal (de), rechtswidrig (de)
- Greek: παράνομος (el) (paránomos), έκνομος (el) (éknomos), άνομος (el) (ánomos)
- Ancient: παράνομος (paránomos), ἀθέμιτος (athémitos)
- Hawaiian: kū ʻole i ke kānāwai, mawaho o ke kānāwai
- Hebrew: בלתי חוקי m (biltí khukí)
- Hungarian: illegális (hu)
- Icelandic: ólöglegur (is)
- Irish: neamhdhleathach, aindleathach, mídhleathach, neamhdhlíthiúil
- Italian: illegale (it)
- Japanese: 不法の (ja) (fuhō no), 違法の (ja) (ihō no)
- Kazakh: заңсыз (zañsyz)
- Khmer: ខុសច្បាប់ (khosachbab)
- Korean: 불법적인 (bulbeopjeog-in)
- Kurdish:
- Northern Kurdish: neqanûnî (ku), qedexe (ku), memnûh (ku), yasax (ku), qaçax (ku), derqanûn (ku)
- Latin: illicitus
- Latvian: pretlikumīgs
- Lithuanian: neteisėtas
- Macedonian: незаконски m (nezakonski), незаконит m (nezakonit), противзаконски m (protivzakonski), нелегален m (nelegalen), и́легален m (ílegalen)
- Maori: turekore
- Mongolian: хууль бус (xuulʹ bus)
- Norwegian:
- Bokmål: ulovlig (no), forbudt, lovstridig, illegal
- Nynorsk: ulovleg
- Occitan: illegal (oc)
- Plautdietsch: onjesazlich
- Polish: nielegalny (pl)
- Portuguese: ilegal (pt)
- Romanian: ilegal (ro), nelegal (ro)
- Russian: незако́нный (ru) (nezakónnyj), нелега́льный (ru) (nelegálʹnyj), неправоме́рный (ru) (nepravomérnyj)
- Serbo-Croatian: ilegalan (sh), nezakonit (sh)
- Slovak: ilegálny, nezákonný
- Spanish: ilegal (es)
- Swahili: haramu (sw)
- Swedish: olaglig (sv), illegal (sv), lagstridig (sv)
- Tatar: яшерен (yaşeren)
- Thai: ที่ผิดกฎหมาย (Thī̀ p̄hid kḍh̄māy)
- Turkish: yasa dışı (tr), illegal (tr)
- Ukrainian: незако́нний (nezakónnyj), нелега́льний (nelehálʹnyj)
- Uyghur: قانۇنسىز (qanunsiz)
- Vietnamese: bất hợp pháp (vi), trái phép (vi)
- Welsh: anghyfreithlon (cy), anghyfreithiol (cy)
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