unforgivable, inexcusable
It is unforgivable.
It was an unforgivable mistake.
Si existe cosa tal como un acto imperdonable, es el acto de no perdonar.
If there is such a thing as an unforgivable act, it is the act of not forgiving.
La vergüenza que has traído a casa es imperdonable.
The shame you have brought home is unforgivable.
— Contra la pared (2004)
That was unforgivable.
Your behavior is unforgivable.
Ése fue un error imperdonable.
That was an unforgivable mistake.
Lo que este demonio hizo, es imperdonable.
What this demon did is unforgivable.
— Guardianes de la Noche: Tren infinito (2020)
It is my unforgivable mistake.
— La ironía del destino, o goce de su baño (1976)