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acidulous (adj) tasting slightly sour (from the word acid); sharp tongued.
If a liquid tastes sour, it is acidulous in taste. A person's unpleasant remarks hurting others are acidulous.
- The acidulous flavor of the medicine turned the child away from it.
- Though I know its efficacy as a medicine, I don't like to take it, because of its acidulous taste.
- I avoid talking to her because her words are usually acidulous.
- The professor is very highly learned, but for all that, he is unpopular because of his acidulous tongue.