VERB
削弱…的效能;損害;使失效;使變質
If something is vitiated, its effectiveness is spoiled or weakened.
例句
Strategic policy during the War was vitiated because of a sharp division between 'easterners' and 'westerners'...
由于“東方人”和“西方人”之間存在巨大的分歧，戰爭期間的戰略方針沒有得到切實的執行。
But this does not vitiate his scholarship.
但這不會威脅到他的獎學金。