sideliner

[ sahyd-lahy-ner ]
/ ˈsaɪdˌlaɪ nər /

noun

a person who is on the sidelines and does not participate in an activity or situation.

Words nearby sideliner

sidehead, sidehill, sidekick, sidelight, sideline, sideliner, sidelines, sideling, sideload, sidelock, sidelong