a person who observes without taking part
WordReference Random House Learner's Dictionary of American English © 2025
on•look•er /ˈɑnˌlʊkɚ, ˈɔn-/USA pronunciation
n. [countable]
WordReference Random House Unabridged Dictionary of American English © 2025- a person watching or looking at some action;
spectator:onlookers to an accident.
on•look•er
(on′lŏŏk′ər, ôn′-),USA pronunciation n.
- spectator;
observer;
witness.
- on + looker, after verb, verbal phrase look on 1600–10
Collins Concise English Dictionary © HarperCollins Publishers::
'onlooker' also found in these entries (note: many are not synonyms or translations):