negate (v.)

• abate
• abnegate
• abolish
• abrogate
• annihilate
• annul
• belie
• break
• buffer
• cancel
• challenge
• clash
• collide
• conflict
• contest
• contradict
• contravene
• controvert
• counter
• counteract
• counterbalance
• countercheck
• cross
• decline
• deflate
• deny
• differ
• disaccord
• disagree
• disallow
• disbelieve
• disclaim
• discredit
• disprove
• dissent
• explode
• expose
• frustrate
• gainsay
• impugn
• invalidate
• jangle
• jar
• jostle
• misbelieve
• mismatch
• mismate
• negative
• neutralize
• nullify
• object
• offset
• oppugn
• puncture
• quash
• rebut
• redress
• refuse
• reject
• repeal
• repudiate
• revoke
• stultify
• thwart
• traverse
• undercut
• undo
• vary
• vitiate
• void