hard to
That was hard to believe.
Había un olor dulce encantador, difícil de resistir.
There was a lovely sweet smell, hard to resist.
— El chico y la garza (2023)
No sé porque es tan difícil de entender.
I don't know why it's so hard to understand.
— O Auto da Compadecida (2000)
El amor es difícil de definir.
Love is difficult to define.
El silencio es un argumento difícil de contradecir.
Silence is a difficult argument to refute.
That's hard to say.
Una guerra es fácil de empezar, pero difícil de terminar.
A war is easy to start, but difficult to end.