vitiate

vi|ti|ate /v'ɪʃieɪt/ (vitiates vitiating vitiated)
[VERB] be V-ed, V n
If something is vitiated, its effectiveness is spoiled or weakened. (FORMAL)
Strategic policy during the War was vitiated because of a sharp division between `easterners' and `westerners'...
But this does not vitiate his scholarship.

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