[ vish-ee-eyt ]

  1. to spoil, make faulty
  2. to reduce the value, quality, or effectiveness of something

Examples of vitiate in a sentence:

  • If you think that crossing your fingers behind your back is going to vitiate the promise you made, think again.
  • Because of the obnoxious behavior of the defendant, the judge instructed the jury not to allow their personal feelings vitiate their objectivity in the case.