Noun

1. The condition of being impure; because of contamination, pollution, adulteration or insufficient purification.

   Even animals in the Jewish system cause impurity only when they are dead.

2. A component or additive that renders something else impure.

   The impurities in the iron ore made extraction of the iron very difficult.

3. A state of immorality or sin; especially the weakness of the flesh: inchastity.

   With his cheating, lying and stealing, he epitomised the impurity of humanity.