An outcast is someone who's rejected or excluded from social groups.
Think about it like this: when people join clubs, teams, or friend circles at school or work, they might not all get along. Maybe one person's opinions are too different, or they've done something that others don't agree with. If this happens, the person can become an outcast – someone who's no longer included in social activities and conversations because of their behavior or differences. It's not always a result of being bad at things; sometimes it just means people start to choose sides.
To cast out; to banish.
That has been cast out; banished, ostracized.
