vitiate


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]