nullify

nullify verb abolish, abrogate, ad inritum redigere, annul, cancel, cast aside, counteract, countermand, declare null and void, deprive of efficacy, deprive of legal force, disannul, dissolve, invalidate, make useless, make valueeess, make void, negate, neutralize, obliterate, offset, override, overrule, overturn, quash, recall, recant, render invalid, renege, repeal, repudiate, rescind, retract, reverse, revoke, suspend, vacate, vitiate, void

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See also: abate, abolish, abrogate, adeem, alleviate, annul, balk, cancel, contravene, counteract, defeat, destroy, disable, disavow, discharge, disinherit, disown, disprove, dissolve, eliminate, eradicate, expunge, extinguish, extirpate, frustrate, invalidate, kill, negate, neutralize, obliterate, override, overrule, overthrow, quash, recall, recant, renege, repeal, repudiate, rescind, revoke, supersede, terminate, vacate, vitiate, void, withdraw