Astringency is a harsh flavor sensation, acridA general negative flavor term, from defect bean, bad roast, or bad brewing: Unpleasantly sharp, astringent or bitter to the taste or smell flavor, that provokes a physical reaction on the toungue, the tactile feeling of papery dryness. It can have saltiness, sourness and bitterness as components. It is certainly the opposite of sweetnessSweetness is an important positive quality in fine coffees, and is one of five basic tastes: Sour, Sweet, Salty, Bitter, Savory (Umami). In coffee, sweetness is a highly... and cleanness in coffee, always a defectIn coffee, a defect refers to specific preparation problems with the green coffee, or a flavor problem found in the cupping process. Bad seeds in the green coffee... flavor.