The Oxford Thesaurus An A-Z Dictionary of Synonyms - impureadj.

1) dirty, soiled, unclean, sullied, tainted, polluted, defiled, foul, filthy, feculent, infected, scummy, putrid, putrescent, rotten: The water is impure and not fit to drink. 2 mixed, alloyed, contaminated, adulterated, debased, unrefined: Impure ore contains other substances which are removed during processing. 3) unclean, unhallowed, forbidden, disallowed, Judaism tref or treif or treifa: Certain foods are considered impure in some religions. 4) unchaste, immoral, sinful, wicked, evil, vile, unvirtuous, unvirginal, corrupted, defiled, debased, vitiated, degenerate, depraved, loose, wanton, lustful, promiscuous, libidinous, dissolute, licentious, obscene, prurient, dirty, filthy, lubricious or lubricous, salacious, lascivious, lewd, lecherous: The book was condemned as 'likely to encourage impure thoughts'.