"vitiate" in the verb sense
1. corrupt, pervert, subvert, demoralize, demoralise, debauch, debase, profane, vitiate, deprave, misdirect
corrupt morally or by intemperance or sensuality
"debauch the young people with wine and women"
"Socrates was accused of corrupting young men"
"Do school counselors subvert young children?"
"corrupt the morals"
2. mar, impair, spoil, deflower, vitiate
"nothing marred her beauty"
3. invalidate, void, vitiate
take away the legal force of or render ineffective
"invalidate a contract"
Source: WordNet® (An amazing lexical database of English)
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