vitiate (
http://definr.com/vitiate)
v 1: corrupt morally or by intemperance or sensuality; "debauch
the young people with wine and women" [syn:
corrupt,
pervert,
demoralize,
demoralise,
debauch,
debase,
profane,
deprave,
misdirect]
2: make imperfect; "nothing marred her beauty" [syn:
mar,
impair,
spoil,
deflower]
3: take away the legal force of or render ineffective;
"invalidateas a contract" [syn:
invalidate,
void]
[ant:
validate]