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Explanation: lightly tannic and pleasantly bitter!
I would stay with bitter.
I have not found Agrognolo in any wine glossary, agro-dolce is "sweet and sour" in english but when referring to wine one usually talks about a bitter taste.
Sour gives me the impression of cork rot!!!!!
Bitter is a synonym of sour (thesaurus)
Food/drink/wine can go sour. I've never heard of people saying that they go Bitter!!!! So, I'd stick with Bitter.