Meaning : Be in contradiction with.
Synonyms : belie, contradict
Meaning : Deny the truth of.
Synonyms : contradict, contravene
Meaning : Prove negative. Show to be false.
Synonyms : contradict
Establish or strengthen as with new evidence or facts.
His story confirmed my doubts.Meaning : Make ineffective by counterbalancing the effect of.
Example :
Her optimism neutralizes his gloom.
This action will negate the effect of my efforts.
Synonyms : neutralise, neutralize, nullify