/ ɪmˈpjʊə(r); NAmE ɪmˈpjʊr/ adjective
1.
not pure or clean; not consisting of only one substance but mixed with one or more substances often of poorer quality :
impure gold
2.
( old-fashioned or formal ) ( of thoughts or feelings ) morally bad, especially because they are connected with sex
OPP pure
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WORD ORIGIN
late Middle English (in the sense dirty, containing offensive matter ): from Latin impurus , from in- not + purus pure.