invalidate Synonyms

vitiate cancel quash disprove annul nullify avoid void negate retract reverse rescind repudiate repeal refute redargue recall rebut ratten revoke stet undermine watergate cancel out call off debunk counter check rappeller set aside withdraw weaken voiding veto vacate undo overturn overthrow overrule disallow deny counterwork countermand controvert contradict confute confound abolish belie becripple avoiding