Longman Dictionary of Contemporary English homepage

impure

 adjective
     
im‧pure
1 not pure or clean, and often consisting of a mixture of things instead of just one [≠ pure]:
drug dealers selling impure heroin
2 old-fashioned impure thoughts, feelings etc are morally bad because they are about sex - sometimes used humorously:
He tried, without success, to rid his mind of any impure thoughts about Julia.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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