unforgivable
Lo que este demonio hizo, es imperdonable.
What this demon did is unforgivable.
— Demon Slayer: Mugen Train La película (2020)
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.
It is unforgivable.
It was an unforgivable mistake.
It was unforgivable.
That was unforgivable.
Lo que mi madre te hizo es imperdonable.
What my mother did to you is unforgivable.
— Locamente millonarios (2018)
It is my unforgivable mistake.
— Ирония судьбы, или С легким паром! (1976)