1. (verb) invalidate, annul, quash, void, avoid, nullify
declare invalid
Synonyms: ward off, empty, fend off, keep off, avoid, quash, keep down, neutralize, annul, overturn, lift, neutralise, head off, nullify, deflect, stave off, rescind, subjugate, evacuate, reduce, avert, vitiate, repeal, invalidate, debar, forefend, negate, forfend, reverse, obviate, revoke, vacate, subdue, cancel, void, countermand, repress
2. (verb) invalidate, nullify
show to be invalid
Synonyms: neutralise, void, nullify, vitiate, neutralize, annul, avoid, cancel, invalidate, negate, quash
3. (verb) neutralize, neutralise, nullify, negate
make ineffective by counterbalancing the effect of
Synonyms: waste, countervail, avoid, counterbalance, contravene, knock off, belie, annul, counteract, invalidate, neutralise, neutralize, negate, nullify, quash, contradict, liquidate, do in, void
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Synonyms and Antonyms of nullify 
