the.com/outsiders
People standing at the window of a party that never sent them an invitation.
means Those who don't belong to a particular group, place, or social circle, viewed from within it.
from Plain English compound from the 1500s: literally those on the outer side, who eventually became the people the inside whispers about.
Hinton novelS.E. Hinton wrote The Outsiders at sixteen.
Betting termLong-shot horses unlikely to win are outsiders.
ParadoxEvery group's outsider is another group's insider.