Synonym word of negation:
antithesis, antonym, blank, cancellation, contrary, converse, counterpart, disavowal, disclaimer, forget it, gainsaying, inverse, negatory, neutralization, no, nonexistence, nothingness, nullification, nullity, opposite, opposition, proscription, refusal, rejection, renunciation, repudiation, reverse, vacuity, veto, void
antithesis, antonym, blank, cancellation, contrary, converse, counterpart, disavowal, disclaimer, forget it, gainsaying, inverse, negatory, neutralization, no, nonexistence, nothingness, nullification, nullity, opposite, opposition, proscription, refusal, rejection, renunciation, repudiation, reverse, vacuity, veto, void