nullify Synonyms

annul cancel invalidate neutralise revoke avoid neutralize repeal quash void negate to abrogate declare invalid declare null and void repudiate rescind retract reverse bring to naught cancel out call off undo vacate veto wipe out vitiate withdraw set aside recant recall countervail countermand counterbalance counteract balance abolish annulled annihilate abrogate destroy disallow dissolve overturn overthrow overrule override offset invalidating invalidated frustrate