underestimated
Podríamos haber subestimado su capacidad.
We may have underestimated their ability.
Sin embargo usted ha subestimado a alguien ¿A quién?
However, you have underestimated someone. Who?
— Hero (2002)
Pudimos haber subestimado el talento de Tom.
We may have underestimated Tom's talent.
He subestimado la fuerza de mi adversario.
I underestimated the strength of my adversary.