abjure
assert the contrary
be contrary to
belie
call into question
challenge
combat
contest
contradict
contravene
controvert
counter
cross
deny
disaffirm
disallow
disavow
disclaim
disown
disprove
dispute
fight
forbid
forswear
impugn
join issue upon
negate
negative
not accept
not admit
nullify
oppose
oppugn
rebut
recant
refuse to admit
refute
reject
renounce
repudiate
resist
retract
revoke
take back
take issue with
traverse
gainsaid
gainsayed
gainsaying
gainsays