"negate" in the verb sense
1. contradict, belie, negate
be in contradiction with
2. contradict, negate, contravene
deny the truth of
3. negate, contradict
prove negative show to be false
4. 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"
Source: WordNet® (An amazing lexical database of English)
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