the.com/outsider

means Someone who stands apart from a group, system, or circle — whether by exclusion, choice, or circumstance — and so views it from the outside rather than within.

from Straightforward carpentry of English: 'outside' (out + side, meaning the outer surface or part) plus the agent suffix '-er,' which turns a place into a person who belongs to it. The word shows up in the 1700s as the plain opposite of 'insider,' originally used quite literally — someone or something located outside — before it picked up its sharper social edge: the one not let into the room, the club, the decision.