1. (verb)contradict, belie, negate be in contradiction with
2. (verb)contradict, negate, contravene deny the truth of
3. (verb)negate, contradict prove negative; show to be false
4. (verb)neutralize, neutralise, nullify, negate make ineffective by counterbalancing the effect of "Her optimism neutralizes his gloom"; "This action will negate the effect of my efforts"