outsider; person outside a group
Refers to someone who does not belong to a particular organization, circle, or category. Often used in contexts like company security, confidential information, or exclusive events.
Outsiders are not allowed to attend this meeting.
You must not leak internal company information to outsiders.
部外者 is a neutral, formal word for someone outside a group, whereas 潜り implies that person is improperly posing as an insider.
部外者 refers to someone who is formally not a member of a group, whereas 外野 used figuratively refers to people who comment on a matter from outside without direct involvement.
部外者 means someone not belonging to a particular organization or group, while 門外漢 is about lacking knowledge in a field rather than group membership.
Compound of 部 (ぶ, 'section, department, group') + 外 (がい, 'outside') + 者 (しゃ, 'person'). Literally 'person outside the group'.