Countersign and Invalidate

Opposite meaning words

Countersign verb - Add one's signature to after another's to attest authenticity.

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Invalidate is an antonym for countersign in endorse topic.

Invalidate verb - To put an end to by formal action.

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Countersign is an antonym for invalidate.

Cite this Source

Invalidate and Countersign. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/countersign/invalidate

Countersign & Invalidate. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/countersign/invalidate>.

Invalidate or Countersign. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/countersign/invalidate.

Google Ngram Viewer shows how "countersign" and "invalidate" have occurred on timeline