had been alarming
-había estado alarmando
Past perfect progressiveconjugation ofalarm.There are other translations for this conjugation.

alarm

If the conduct of the men had been alarming in the boat, it became truly threatening when they had come aboard.
Si el comportamiento de la tripulación había empezado a inquietarme ya en los botes, cuando regresaron a bordo se hizo claramente amenazador.
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