A casual onlooker refers to someone who is observing a situation or event without paying much attention or being deeply involved. They are usually just observing out of curiosity or passing interest. Full definition
While many casual onlookers would point out a missed one - on - one in the first half and the miserably scuffed shot at the end of the second, Welbeck's influence was noted. (theshortfuse.sbnation.com)
BY BRAD HOYLMAN For even the most casual onlooker, Albany has rarely been a model of functional governance. (thevillager.com)
The Armory Show, New York's annual blockbuster art fair drew thousands of art world VIPs and casual onlookers alike to the city's Piers 92 and 94 March 6 - 9, 2014. (drosteeffectmag.com)