invalidate (v.)

• abate
• abolish
• abrogate
• annihilate
• annul
• belie
• buffer
• cancel
• counterbalance
• countermand
• deflate
• discredit
• disprove
• disqualify
• explode
• expose
• frustrate
• negate
• negative
• neutralize
• nullify
• offset
• override
• overrule
• puncture
• quash
• recall
• recant
• renege
• repeal
• rescind
• retract
• reverse
• revoke
• stultify
• suspend
• thwart
• undercut
• undo
• unfit
• vacate
• vitiate
• void
• waive
• withdraw