Home › Words › O › onlookeronlooker/ˈɒnlʊkə/onlooker means A spectator; someone looks on or watches, without becoming involved or participating.onlooker is pronounced /ˈɒnlʊkə/.EtymologyFrom on + look + -er, probably from the verb look on, but compare with onlook.nounA spectator; someone looks on or watches, without becoming involved or participating.e.g.“I wasn’t involved in the fight; I was only an onlooker.”Definitions & examples from Wiktionary (CC BY-SA 3.0).