outsider
US /ˌaʊtˈsaɪ.dɚ/
UK /ˌaʊtˈsaɪ.dɚ/

1.
extraño, forastero
a person who is not part of a particular group, organization, or community
:
•
As an outsider, he found it hard to understand their traditions.
Como un extraño, le resultó difícil entender sus tradiciones.
•
The new student felt like an outsider in the class.
El nuevo estudiante se sintió como un extraño en la clase.
2.
tapado, desconocido
a competitor or contestant thought to have little chance of winning a race or competition
:
•
The horse was a complete outsider, but it won the race.
El caballo era un completo tapado, pero ganó la carrera.
•
No one expected the outsider team to reach the finals.
Nadie esperaba que el equipo tapado llegara a la final.