abate
abjure
abolish
abrogate
absolve
annihilate
annul
assert the contrary
belie
bring to naught
bring to nothing
buffer
cancel
cancel out
come to nothing
compensate
confine
contest
contradict
contravene
controvert
counter
counteract
counterbalance
countermand
counterorder
countervail
cross
declare a moratorium
deny
disaffirm
disallow
disannul
disavow
disclaim
disown
disprove
dispute
do away with
forswear
frustrate
gainsay
impugn
invalidate
irritate
nullified
negate
weaken
nullifies
nullifying
create