To make ineffective by applying an opposite force or amount

• nullify

  1. To make null; invalidate.
  2. To counteract the force or effectiveness of.

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  1. To make null; invalidate.
  2. To counteract the force or effectiveness of.

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• neutralize

  1. To make neutral.
  2. To counterbalance or counteract the effect of; render ineffective.
  3. To declare neutral and therefore inviolable during a war.

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  1. To make neutral.
  2. To counterbalance or counteract the effect of; render ineffective.
  3. To declare neutral and therefore inviolable during a war.

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• counteract

  1. To oppose and mitigate the effects of by contrary action; check.

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  1. To oppose and mitigate the effects of by contrary action; check.

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• cancel

  1. To annul or invalidate:
  2. To decide or announce that (a planned or scheduled event) will not take place, especially with no intention of holding it at a later time:
  3. To cross out with lines or other markings.

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  1. To annul or invalidate:
  2. To decide or announce that (a planned or scheduled event) will not take place, especially with no intention of holding it at a later time:
  3. To cross out with lines or other markings.

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To put an end to, especially formally and with authority

• extinguish

  1. To cause (a fire or light) to stop burning or shining; put out.
  2. To put an end to or make extinct; destroy:
  3. To bring about the extinction of (a conditioned response).

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  1. To cause (a fire or light) to stop burning or shining; put out.
  2. To put an end to or make extinct; destroy:
  3. To bring about the extinction of (a conditioned response).

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• void

  1. Containing no matter; empty.
  2. Not occupied; unfilled.
  3. Completely lacking; devoid:

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  1. Containing no matter; empty.
  2. Not occupied; unfilled.
  3. Completely lacking; devoid:

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• vitiate

  1. To reduce the value or quality of; impair or spoil:
  2. To corrupt morally; debase:
  3. To make ineffective (a contract or legal stipulation, for example); invalidate.

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  1. To reduce the value or quality of; impair or spoil:
  2. To corrupt morally; debase:
  3. To make ineffective (a contract or legal stipulation, for example); invalidate.

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• set-aside

  1. Something, such as land or a certain percentage of profits, that is set aside for a specific purpose.
  2. A program requiring that a percentage of government procurement contracts be reserved for disadvantaged businesses.

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  1. Something, such as land or a certain percentage of profits, that is set aside for a specific purpose.
  2. A program requiring that a percentage of government procurement contracts be reserved for disadvantaged businesses.

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• nullify

  1. To make null; invalidate.
  2. To counteract the force or effectiveness of.

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  1. To make null; invalidate.
  2. To counteract the force or effectiveness of.

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• invalidate

  1. To make invalid; nullify.

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  1. To make invalid; nullify.

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• cancel

  1. To annul or invalidate:
  2. To decide or announce that (a planned or scheduled event) will not take place, especially with no intention of holding it at a later time:
  3. To cross out with lines or other markings.

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  1. To annul or invalidate:
  2. To decide or announce that (a planned or scheduled event) will not take place, especially with no intention of holding it at a later time:
  3. To cross out with lines or other markings.

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• annul

  1. To make or declare void or invalid, as a marriage or a law; nullify.
  2. To bring to an end the effect or existence of; cancel out:

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  1. To make or declare void or invalid, as a marriage or a law; nullify.
  2. To bring to an end the effect or existence of; cancel out:

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• annihilate

  1. To destroy completely:
  2. To reduce to nonexistence:
  3. To defeat decisively:

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  1. To destroy completely:
  2. To reduce to nonexistence:
  3. To defeat decisively:

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• abrogate

  1. To abolish, do away with, or annul, especially by authority:

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  1. To abolish, do away with, or annul, especially by authority:

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• abolish

  1. To do away with; put an end to; annul:
  2. To destroy completely.

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  1. To do away with; put an end to; annul:
  2. To destroy completely.

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To refuse to admit the truth, reality, value, or worth of

• traverse

  1. To travel or pass across, over, or through:
  2. To move to and fro over; cross and recross:
  3. To go up, down, or across (a slope) diagonally, as in skiing.

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  1. To travel or pass across, over, or through:
  2. To move to and fro over; cross and recross:
  3. To go up, down, or across (a slope) diagonally, as in skiing.

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• oppugn

  1. To oppose, contradict, or call into question.

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  1. To oppose, contradict, or call into question.

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• negative

  1. Expressing, containing, or consisting of a negation, refusal, or denial:
  2. Indicating opposition or resistance:
  3. Unpleasant; disagreeable:

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  1. Expressing, containing, or consisting of a negation, refusal, or denial:
  2. Indicating opposition or resistance:
  3. Unpleasant; disagreeable:

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• gainsay

  1. To declare to be false; deny.
  2. To oppose (someone), especially by contradiction:

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  1. To declare to be false; deny.
  2. To oppose (someone), especially by contradiction:

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• disaffirm

  1. To reject (a determination or obligation that is subject to approval).

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  1. To reject (a determination or obligation that is subject to approval).

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• deny

  1. To declare untrue; assert to be false:
  2. To refuse to believe; reject:
  3. To refuse to recognize or acknowledge; disavow:

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  1. To declare untrue; assert to be false:
  2. To refuse to believe; reject:
  3. To refuse to recognize or acknowledge; disavow:

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• controvert

  1. To raise arguments against; voice opposition to.

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  1. To raise arguments against; voice opposition to.

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• contravene

  1. To act or be in violation of (a law, directive, or principle, for example); violate:
  2. To be inconsistent with; be contrary to:

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  1. To act or be in violation of (a law, directive, or principle, for example); violate:
  2. To be inconsistent with; be contrary to:

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• contradict

  1. To assert to be untrue, often by saying the opposite:
  2. To assert the opposite of a statement or idea put forward by (someone).
  3. To be contrary to; be inconsistent with:

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  1. To assert to be untrue, often by saying the opposite:
  2. To assert the opposite of a statement or idea put forward by (someone).
  3. To be contrary to; be inconsistent with:

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To nullify

• neutralize

  1. To make neutral.
  2. To counterbalance or counteract the effect of; render ineffective.
  3. To declare neutral and therefore inviolable during a war.

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  1. To make neutral.
  2. To counterbalance or counteract the effect of; render ineffective.
  3. To declare neutral and therefore inviolable during a war.

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• retract

  1. To take back; disavow:
  2. To draw back or in:
  3. To utter (a sound) with the tongue drawn back.

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  1. To take back; disavow:
  2. To draw back or in:
  3. To utter (a sound) with the tongue drawn back.

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• repeal

  1. To revoke or rescind, especially by the action of a legislature.
  2. To summon back or recall, especially from exile.
  3. The act or process of repealing.

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  1. To revoke or rescind, especially by the action of a legislature.
  2. To summon back or recall, especially from exile.
  3. The act or process of repealing.

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To contradict

• refute

  1. To prove to be false or erroneous; overthrow by argument or proof:
  2. To deny the accuracy or truth of:
  3. To repudiate.

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  1. To prove to be false or erroneous; overthrow by argument or proof:
  2. To deny the accuracy or truth of:
  3. To repudiate.

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• oppose

  1. To be or act in contention or conflict with:
  2. To be hostile or resistant to; try to prevent:
  3. To set as an opposite in position:

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  1. To be or act in contention or conflict with:
  2. To be hostile or resistant to; try to prevent:
  3. To set as an opposite in position:

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• belie

  1. To give a false representation to; misrepresent:
  2. To show to be false; contradict:

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  1. To give a false representation to; misrepresent:
  2. To show to be false; contradict:

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