The word for today is…
vitiate (verb):
1: to make faulty or defective : impair
2: to debase in moral or aesthetic status
3: to make ineffective
Source : Merriam -Webster
Etymology : Vitiate comes ultimately from the Latin noun vitium, which refers to a fault, vice, shortcoming, or impediment to success or perfection. Accordingly, vitiate—like its fellow vitium-descended v-words vituperate ("to use harsh, condemning language"), vicious, and vice—has a negative bent. To vitiate something is, essentially, to mar or damage it in some way, whether by ruining or spoiling it ("a joke vitiated by poor timing"), corrupting it morally ("a mind vitiated by prejudice"), or rendering it null or ineffective ("fraud that vitiates a contract"). Despite its versatility, vitiate is most effective when used in formal speech and writing.
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