pollute

Short definition from Wiktionary

Verb

1. 1
   To make something harmful, especially by the addition of some unwanted product.
2. 2
   To make something or somewhere less suitable for some activity, especially by the introduction of some unnatural factor.
3. 3
   To corrupt or profane
4. 4
   To violate sexually; to debauch; to dishonour.

Adjective

1. 1
   Polluted; defiled.