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" ;