perdedor
/peɾdeˈdoɾ/ · B1 · adj
loser
perdedor = perder (to lose) + -dor (the -er suffix): a los-er
Spanish -dor marks the one who does the verb, as in jugador (player) from jugar. Perder comes from Latin perdere, to lose or destroy, so perdedor is the one who loses. It also works as an adjective: el equipo perdedor means the losing team.