<p><strong>Verb (used with object)</strong></p><ul><li>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): to adulterate food.</li></ul><p><strong>Adjective</strong></p><ul><li>Impure or debased; cheapened in quality or purity.</li><li>Adulterous.</li></ul>