Bystander

n.

1.

One who stands near; a spectator; one who has no concern with the business transacting. He addressed the bystanders and scattered pamphlets among them. - Palfrey.

Noun

1.

bystander - a nonparticipant spectator

TV-viewer, abutter, adjoiner, attestant, attestator, attester, beholder, bird-watcher, borderer, cojuror, compurgator, deponent, drugstore cowboy, earwitness, eyewitness, gaper, gazer, gazer-on, girl-watcher, goggler, immediate neighbor, informant, informer, kibitzer, looker, looker-on, neighbor, neighborer, observer, ogler, perceiver, percipient, seer, sidewalk superintendent, spectator, spectatress, spectatrix, swearer, tangent, televiewer, television-viewer, testifier, video-gazer, voucher, witness