noun a person who watches an event or situation without taking part in it
An onlooker may be a witness to a psychological experiment or therapy session.
Onlookers are spectators at sporting events, observing the competition.
Onlookers are tourists observing landmarks or attractions.
Onlookers may be bystanders at the scene of a natural disaster or emergency situation.
Onlookers may be witnesses to a crime or part of the investigation process.
In a novel, the writer described the scene with the protagonist being surrounded by onlookers.
The psychologist observed the behavior of the onlookers during the social experiment.
The journalist interviewed an onlooker who witnessed the accident.
The police officer asked the onlookers if they saw anything suspicious.
The event planner made sure to have designated areas for onlookers to watch the performance.