nullify

Verb
  1. Declare invalid (synset 202483482)
    "The contract was annulled"; "void a plea"
    is a type of: cancel, strike down - declare null and void; make ineffective
    subtypes:
    • set aside - annul (a legal decision)
    • break - invalidate by judicial action
    • stet - printing: cancel, as of a correction or deletion
    same as: annul, avoid, invalidate, quash, void
  2. Show to be invalid (synset 200669020)
    is a type of: contradict, negate - prove negative; show to be false
    same as: invalidate
  3. Make ineffective by counterbalancing the effect of (synset 200471015)
    "Her optimism neutralizes his gloom"; "This action will negate the effect of my efforts"
    is a type of: weaken - lessen the strength of
    same as: negate, neutralise, neutralize

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