In other languages: необов'язковий (Ukrainian), freiwillig (German), optionnel (French), opcional (Spanish), opcjonalny (Polish).
Arabic
اختياريiḵtiyāriyy
Armenian
կամընտիրkaməntir
Also: ոչ պարտադիր
Belarusian
неабавязковыnjeabavjazkóvy
Also: апцыянальны, факультатыўны
Bosnian
izborno≈
Also: izboran, izborna
Do people say it like this?
Bulgarian
по изборpo izbor
Also: незадължителен
Catalan
opcional
Croatian
izborno≈
Also: izboran, izborna
Do people say it like this?
Czech
volitelný
Danish
frivillig
Also: valgfri
Dutch
optioneel
English
optional/ˈɒp.ʃə.nəl/
Finnish
valinnainen
French
optionnel
Also: facultatif
Georgian
ნებაყოფლობითიnebaq̇oplobiti
Also: არასავალდებულო, ფაკულტატიური
German
freiwillig
Also: optional, wahlfrei
Greek
προαιρετικόςproairetikós
Also: κατ’ εκλογήν
Hindi
वैकल्पिकvaikalpik
Hungarian
választható
Also: fakultatív, tetszőleges
Icelandic
valfrjáls
Italian
facoltativo
Also: opzionale, volontario
Latin
facultativus
Norwegian Bokmål
valgfri
Also: fakultativ, frivillig
Persian
اختیاریextiyâri
Polish
opcjonalny
Also: fakultatywny
Portuguese
opcional
Also: facultativo
Russian
необязательныйneobjazátelʹnyj
Also: опциональный, факультативный
Serbian
изборно
Also: изборан, изборна
Spanish
opcional
Swedish
valfritt
Also: fakultativt, frivilligt
Turkish
isteğe bağlı
Also: opsiyonel, opsiyonlu
Ukrainian
необов'язковийneobovʺjazkóvyj
Also: опціональний, факультативний
Do people say it like this where you live?