verb
1.
Synonyms: deny 4, contradict, contravene, cross, disaffirm, gainsay, impugn, negative, traverse
Antonyms: affirm
2.
Synonyms: abolish 1, abate, abrogate, annihilate, annul, invalidate, nullify, quash, undo, vitiate
3.
Synonyms: neutralize , annul, cancel (out), counteract, countercheck, frustrate, negative, redress