I've found a couple words that might work for your purposes. Click on the Dovahzul words below to see their Dictionary pages for notes on connotation and usage.

Funt - Fail, failure (This is the most accurate translation.)

Viik - Defeat (If that is closer to what you're looking for.)

As per usual, much of the translation process in Dovahzul is determined by the context of the word. I can help you get a much more accurate translation if you give me the whole phrase you want to be translated. (Even if it's all in Italian!)