Acidic

Opposite words for acidic:
sweet, sportive, diplomatic, watery, alkalic, waggish, tasteless, alkaline, sociable, droll, genial, basic, suave, alcalescent, good-humored, gracious, mild, dilute, flavorless, savorless, flat, zestless, insipid, saltlike, affable, thin, hospitable, playful, merry, good-natured, amusing, cordial, polite, amphiprotic, gentle, base-forming, weak, bland, alkalescent, amphoteric, smooth, urbane.