vitiate

To impair or make void; to destroy or annul, either completely or partially, the force and effect of an act or instrument.

Mutual mistake or Fraud, for example, might vitiate a contract.

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vitiate verb abolish, abrogate, annul, blight, cancel, counteract, damage, depravare, destroy, disannul, impair, injure, invalidate, make faulty, make imperfect, make immure, make ineffective, make void, mar, negate, negative, neutralize, nullify, overturn, pervert, poison, pollute, quash, render defective, render inefficacious, rescind, reverse, spoil, sully, tamper with, undo, vitiare, weaken
Foreign phrases: Crimen omnia ex se nata vitiat.Crime viiiates all that is born of it.

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See also: abolish, adulterate, annul, contaminate, corrupt, damage, debase, debauch, degenerate, denature, deteriorate, disable, dissolve, impair, infect, invalidate, neutralize, nullify, pervert, pollute, revoke, spoil, subvert, sully, taint, terminate