Princeton's WordNet

1. bystander(noun)

   a nonparticipant spectator

Kernerman English Learner's Dictionary

1. bystander(noun)ˈbaɪˌstæn dər

   sb who sees sth exciting or bad happen

   Innocent bystanders were caught in the gunfire.

Wiktionary

1. bystander(Noun)

   a person who, although present at some event, does not take part in it; an observer or spectator

Webster Dictionary

1. Bystander(noun)

   one who stands near; a spectator; one who has no concern with the business transacting

• bystander, toeskouerAfrikaans
• مُتَفَرِّج، مُشاهِد، واقِف على الحِيادArabic
• наблюдателBulgarian
• espectadorPortuguese (BR)
• divákCzech
• der/die Zuschauer/-inGerman
• tilskuerDanish
• απλός θεατήςGreek
• espectadorSpanish
• kõrvaltvaatajaEstonian
• شاهد واقعه؛ رهگذرFarsi
• sivustakatsojaFinnish
• spectateur/-triceFrench
• צוֹפֶה מֵהַצָדHebrew
• दर्शकHindi
• pasivni promatračCroatian
• nézőHungarian
• penontonIndonesian
• hlutlausáhorfandiIcelandic
• spettatore, spettatriceItalian
• 傍観者Japanese
• 방관자Korean
• stebėtojas, žiopsotojasLithuanian
• skatītājs; novērotājsLatvian
• orang yang berada di tempat kejadianMalay
• omstanderDutch
• tilskuerNorwegian
• widz, gapPolish
• شاهد واقعه؛ رهگذرPersian
• د واقعی ګواه ، په لاره تیریدونکیPashto
• espectadorPortuguese
• spectatorRomanian
• (безучастный) наблюдательRussian
• divákSlovak
• opazovalec, pričaSlovenian
• posmatračSerbian
• åskådareSwedish
• ผู้เห็นเหตุการณ์; ผู้สังเกตการณ์Thai
• seyirciTurkish
• 旁觀者Chinese (Trad.)
• спостерігачUkrainian
• تماشائیUrdu
• người ngoài cuộcVietnamese
• 旁观者Chinese (Simp.)