Translation of "Frustrating" in Dutch

This is incredibly frustrating.

Dat is ongelooflijk frustrerend.

I found that frustrating.

Ik vond dat frustrerend.

Found it a bitter and frustrating experience.

, net als de meeste van Napoleons Marshals, een bittere en frustrerende ervaring.

And that was very frustrating at first, so difficult to discern.

Eerst was dat frustrerend. Zo moeilijk te onderscheiden.