had been frustrating
-había estado frustrando
Past perfect progressiveconjugation offrustrate.There are other translations for this conjugation.

frustrate

It had been frustrating, to say the least, to wait in a tiny cellar for some unknown sign to emerge from their lair.
Como poco, había sido frustrante esperar en una pequeña bodega a una señal desconocida para poder salir de su escondite.
Let us not forget the most magical wand: the one that makes you start moving forward again and lose that seemingly invincible sensation of stagnating that had been frustrating you for a long time.
Y no nos olvidemos de la barita más mágica de todas: la que consigue que usted comience a moverse hacia adelante de nuevo y pierda la que parece ser una sensación invencible de estancamiento que le ha hecho sentirse frustrado durante mucho tiempo.
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