Used to describe someone who pretends to be someone else.
La impostora logró engañar a muchos, pero finalmente la verdad salió a la luz y su fraude fue expuesto.
The imposter managed to deceive many, but eventually the truth came to light and her fraud was exposed.
La impostora logró engañar a todos en la fiesta con su disfraz impresionante.
The imposter managed to deceive everyone at the party with her impressive disguise.