| slovenčina | slk-000 |
| neznámy | |
| العربية | arb-000 | مجهل |
| PanLem | art-000 | zxx |
| ISO 639 | art-005 | zxx |
| PanLex Intellectual Property Licenses | art-299 | zxx |
| беларуская | bel-000 | невядомы |
| bosanski | bos-000 | nepoznat |
| български | bul-000 | неизвестен |
| bălgarski ezik | bul-001 | neizvésten |
| català | cat-000 | desconegut |
| čeština | ces-000 | neznámý |
| ѩзыкъ словѣньскъ | chu-000 | нєвєстьнъ |
| slověnĭskŭ językŭ | chu-001 | nevestĭnŭ |
| Deutsch | deu-000 | Unbekannte |
| Deutsch | deu-000 | dunkel |
| Deutsch | deu-000 | fremd |
| Deutsch | deu-000 | fremde |
| Deutsch | deu-000 | unbekannt |
| Deutsch | deu-000 | unbekannte |
| Deutsch | deu-000 | ungewohnt |
| English | eng-000 | alien |
| English | eng-000 | anonym |
| English | eng-000 | nameless |
| English | eng-000 | novel |
| English | eng-000 | numinous |
| English | eng-000 | obscure |
| English | eng-000 | strange |
| English | eng-000 | stranger |
| English | eng-000 | unbeknown |
| English | eng-000 | undisclosed |
| English | eng-000 | unfamiliar |
| English | eng-000 | unheard-of |
| English | eng-000 | unheart-of |
| English | eng-000 | unknown |
| 𐐀𐑍𐑊𐐮𐑇 | eng-006 | 𐐲𐑌𐑌𐐬𐑌 |
| Australian English | eng-009 | unknown |
| New Zealand English | eng-010 | unknown |
| Esperanto | epo-000 | nesciata |
| euskara | eus-000 | ezezagun |
| suomi | fin-000 | tuntematon |
| français | fra-000 | inconnu |
| français | fra-000 | étrange |
| Српскохрватски | hbs-000 | непознат |
| Srpskohrvatski | hbs-001 | nepoznat |
| magyar | hun-000 | ismeretlen |
| italiano | ita-000 | sconosciuto |
| la lojban. | jbo-000 | na djuno |
| 日本語 | jpn-000 | 不明 |
| Nihongo | jpn-001 | fumei |
| にほんご | jpn-002 | ふめい |
| нихонго | jpn-153 | фумэй |
| македонски | mkd-000 | непознати |
| bokmål | nob-000 | ukjent |
| polski | pol-000 | nieznany |
| português | por-000 | desconhecido |
| português brasileiro | por-001 | desconhecido |
| português europeu | por-002 | desconhecido |
| русский | rus-000 | неизвестный |
| russkij | rus-001 | neizvéstnyj |
| slovenščina | slv-000 | neznan |
| español | spa-000 | desconocido |
| српски | srp-000 | непознат |
| srpski | srp-001 | nepoznat |
| svenska | swe-000 | okänd |
| Türkçe | tur-000 | bilinmeyen |
| українська | ukr-000 | невідомий |