gainsay (v.)

• abjure
• belie
• challenge
• combat
• contest
• contradict
• contravene
• controvert
• counter
• cross
• deny
• disallow
• disavow
• disclaim
• disown
• disprove
• dispute
• fight
• forswear
• impugn
• negate
• negative
• nullify
• oppose
• oppugn
• rebut
• recant
• refute
• reject
• renounce
• repudiate
• resist
• retract
• revoke
• traverse
• withstand