VITIATE
- to make faulty or defective impair.
- to impair the value or quality of [v VITIATED, VITIATES, VITIATING] : VITIABLE [adj]
- to impair the quality or effectiveness of
- to make legally invalid
- to make faulty or defective impair the comic impact is vitiated by obvious haste William Styron
- make ineffective fraud vitiates a contract