invalidate

Etymology

in- + Latin valere (“to be strong”)

verb

  1. To make invalid. Especially applied to contract law.
    The circuit court judge's ruling was invalidated by a superior judge.
  2. To make or declare (an argument, statement, or theory) unsound or erroneous; disprove.
  3. To render invalid; discredit.
    Telling an angry person to "calm down" can invalidate their feelings.

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