impure
adjective uk/ɪmˈpjʊər/ us/ɪmˈpjʊr/
(MIXED)
纯度不高的，有杂质的
mixed with other substances and therefore lower in quality
impure heroin/gold 纯度不高的海洛因／黄金
(BAD)
literary or humorous不纯洁的，淫秽的
involving sexual thoughts or behaviour that are wrong or not moral
She was accused of having impure thoughts about her male students. 她被指责对她的男学生怀有淫邪念头。