1) Acidic 2) Acidulent 3) Being sour to the taste 4) Moderately acid or tart 5) Sharp 6) Slightly sour 7) Sour 8) Subacid 9) Tartish 10) UCLA duo is sarcastic 
sharp or bitter-tasting
• (a.) Slightly sour; sub-acid; sourish; as, an acidulous tincture.
(ә-sid´u-lәs) moderately sour.
A·cid'u·lous adjective [ Latin acidulus , dim. of acidus . See Acid.] Slightly sour; sub-acid; sourish; as, an acidulous tincture. E. Burke. Acidulous mineral waters , 
Very young wine with a high level of acidity.
acidulous 1. Acid or sour. 2. Slightly sour, sourish, sub-acid; somewhat acidic. 3. Cutting and sharp in speech or tone.
A clean, pleasant taste describing the slight tanginess of a curd or fresh cheese.
A term denoting excessive total acidity. The threshold for acidulousness is undefined, but certainly a wine with a pH less than 3.1 or a titratable acidity more than 0.9% will taste sour and acidulous. The opposite (taste denoting insufficient total acidity) is flat. 
slightly sour. · sharp; caustic: his acidulous criticism of the book. · moderately acid or tart; subacid.