If something neutralizes the effect of something else, then you can say the effect is negated. Hanging a disco ball from your living room ceiling negates the sleek modern effect created by the contemporary furniture.

If something is proved false or untrue, it has been negated. The discovery of one dinosaur jaw negated the conventional wisdom that all dinosaurs were vegetarians, since the tooth structure proved that guy definitely ate meat. The verb negate can also mean to counteract or counterbalance — so a really strong serve can negate your other weaknesses on the tennis court.

Definitions of negate
  1. verb
    make ineffective by counterbalancing the effect of
    “This action will negate the effect of my efforts”
    synonyms: neutralise, neutralize, nullify
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    type of:
    lessen the strength of
  2. verb
    deny the truth of
    synonyms: contradict, contravene
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    declare untrue; contradict
    make a disclaimer about
    reject as untrue, unfounded, or unjust
    refuse to acknowledge; disclaim knowledge of; responsibility for, or association with
    type of:
    differ, disagree, dissent, take issue
    be of different opinions
  3. verb
    prove negative; show to be false
    synonyms: contradict
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    affirm, confirm, corroborate, substantiate, support, sustain
    establish or strengthen as with new evidence or facts
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    invalidate, nullify
    show to be invalid
    confute, disprove
    prove to be false
    show (a theory or claim) to be baseless, or refute and make obsolete
    controvert, rebut, refute
    prove to be false or incorrect
    prove false
    type of:
    demonstrate, establish, prove, shew, show
    establish the validity of something, as by an example, explanation or experiment
  4. verb
    be in contradiction with
    synonyms: belie, contradict
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    type of:
    depart, deviate, diverge, vary
    be at variance with; be out of line with
Word Family

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