/ɪmˈpjʊə(r) ||; ɪmˈpjυr/adj1 not pure or clean; consisting of more than one substance mixed together (and therefore not of good quality) 不纯净的；有杂质的: impure metals 不纯的金属
2 (old-fashioned 旧) (used about thoughts and actions connected with sex) not moral; bad （指跟性有关的言行思想）下流的，淫猥的 [OPP] pure 反义词为pure