Webster's English Dictionary

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impure

im.pure \(')im-'pyu.(*)r\ aj [F & L; F, fr. L impurus, fr. in- + purus 
   pure] : not pure : as  : UNCHASTE, OBSCENE {~ language}  : containing 
   something unclean : FOUL {~ water}  : ritually unclean  : marked by an 
   intermixture of foreign elements or by substandard, incon gruous, or 
   objectionable locutions : ADULTERATED {an ~ chemical}  : MIXED, BASTARD {an 
   ~ style}  - im.pure.ly av