1. To make foul or unclean, especially with harmful chemical or waste products: Wastes from the factory near the river had polluted it to a dangerous degree.
2. To make someone morally or spiritually impure: The excessive violence presented in films are believed to pollute the minds of people, especially the younger viewers.
3. Etymology: borrowed from Latin pollutus, polluere,"to soil" or "to defile" from pol-, por-, "before" + luere, "to smear"; related to lutum, "mud". dirty; to soil, befoul.

A reference to something that is unclean or impure; contaminated; tainted: The river in town was the most polluted, filthy, and yucky river Mrs. Black had ever seen and it even smelled extremely foul and nasty, so she and her husband decided to more to another cleaner place far away from the river.