adulterate
verb (used with object)
to debase or make impure by adding inferior materials or elements; use cheaper, inferior, or less desirable goods in the production of (any professedly genuine article).
Used to express actions, events, or states that have not yet occurred but are expected to happen.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Indeed, if people will adulterate their coffee, it were much to be wished that they would use nothing more harmful than the Peanut for this purpose.
From The Peanut Plant Its Cultivation And Uses by B. W. Jones