impure [ɪmˈpjʊə(r)]

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adj.不纯净的，不洁的；不道德的，下流的

mixed with other substances and therefore lower in quality

The air of a big city is often impure. 大城市的空气往往是污浊的。
Impure drinking water is a cause of disease. 不洁的饮用水是引发疾病的一个原因。