im·pu·ri·ty 
(ĭm-pyrĭ-tē)
(ĭm-pyrĭ-tē)n. pl. im·pu·ri·ties
1. The quality or condition of being impure, especially:
a. Contamination or pollution.
b. Lack of consistency or homogeneity; adulteration.
c. A state of immorality; sin.
2. Something that renders something else impure; an inferior component or additive.