(v.) To make void; to render invalid; to deprive of legal force or efficacy.

abate abjure abolish abrogate absolve annihilate annul assert the contrary belie bring to naught bring to nothing buffer cancel cancel out come to nothing compensate confine contest contradict contravene controvert counter counteract counterbalance countermand counterorder countervail cross declare a moratorium deny disaffirm disallow disannul disavow disclaim disown disprove dispute do away with forswear frustrate gainsay impugn invalidate join issue upon limit make void negate negativate negative neutralize not accept not admit obliterate offset oppose override overrule quash recall recant refuse to admit refute renege renounce repeal repudiate rescind restrict retract reverse revoke set aside stultify suspend take back take issue with thwart undo vacate vitiate void waive wipe out withdraw write off