VERB
削弱…的效能;损害;使失效;使变质
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“东方人”和“西方人”之间存在巨大的分歧，战争期间的战略方针没有得到切实的执行。
But this does not vitiate his scholarship.
但这不会威胁到他的奖学金。