adulterate

Short definition from Wiktionary

Adjective

1. 1
   Corrupted or made impure by being mixed with something else; adulterated.
2. 2
   Tending to commit adultery; relating to or being the product of adultery; adulterous.

Verb

1. 1
   To corrupt, to debase (someone or something).
2. 2
   To make less valuable or spoil (something) by adding impurities or other substances.
3. 3
   To commit adultery with (someone).
4. 4
   To defile (someone) by adultery.
5. 5
   To commit adultery.