negate
verb
1 legislators immediately took steps to negate the effects of the Court's ruling:
invalidate, nullify, render null and void, render invalid, make ineffective, neutralize, cancel (out);
undo, reverse, annul, void, revoke, rescind, abrogate, repeal, retract, countermand, overrule, overturn;
Law avoid.
▷antonyms confirm, support, validate.