Synonyms: negate, neutralise, neutralize, nullify
Definition: make ineffective by counterbalancing the effect of
Usage: Her optimism neutralizes his gloom; This action will negate the effect of my efforts
Synonyms: nullify, invalidate
Definition: show to be invalid
Similar words: contradict, negate
Definition: prove negative; show to be false
Synonyms: void, avoid, annul, invalidate, nullify, quash
Definition: declare invalid
Usage: The contract was annulled; void a plea
Similar words: strike down, cancel
Definition: declare null and void; make ineffective
Usage: Cancel the election results; strike down a law