bystander
//ˈbaɪˌstændər//
Noun
bystanderSingular
bystandersPlural
1
A person who is present at an event or incident but does not take part in it.
Several bystanders witnessed the accident but did not intervene.

A person who is present at an event or incident but does not take part in it.
Several bystanders witnessed the accident but did not intervene.