See vitiate in Webster's New World Roget's A-Z Thesaurus II
To spoil the soundness or perfection of:
blemish, damage, detract from, disserve, flaw, harm, hurt, impair, injure, mar, prejudice, tarnish. See better, helpTo ruin utterly in character or quality:
animalize, bastardize, bestialize, brutalize, canker, corrupt, debase, debauch, demoralize, deprave, pervert, stain, warp. See clean, helpTo put an end to, especially formally and with authority:
abolish, abrogate, annihilate, annul, cancel, invalidate, negate, nullify, set aside, void. (Law) extinguish. See continueLearn more about vitiate