Main entry: negate, neutralise, neutralize, nullify
Definition: make ineffective by counterbalancing the effect of
Usage: Her optimism neutralizes his gloom; This action will negate the effect of my efforts
Main entry: contradict, negate
Definition: prove negative; show to be false
Main entry: contradict, contravene, negate
Definition: deny the truth of
Main entry: contradict, belie, negate
Definition: be in contradiction with