Harshness and sourness are two of the most widely used negative epithets. Harshly flavored coffees are unpleasantly bitter, sharp, or irritating. Terms like grassy, hidey, barnyard fermented, musty, and Rioy (medicinal) describe even more dramatically undesirable flavor characteristics. All of these characteristics derive from careless processing. Presumably the coffees you taste will be superior, hence free from such defects.
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