Dubious and Unchallengeable

Opposite meaning words

Dubious adjective - Giving good reason for being doubted, questioned, or challenged.

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Unchallengeable is an antonym for dubious.

Nearby Words: dubiety, dubiousness, dubiously

Unchallengeable adjective - Not capable of being challenged or proved wrong.

Usage example: the contention that there are certain unchallengeable rules governing proper grammar

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Dubious is an antonym for unchallengeable.

Nearby Word: unchallenged

Cite this Source

Unchallengeable and Dubious. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/dubious/unchallengeable

Dubious & Unchallengeable. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/dubious/unchallengeable>.

Unchallengeable or Dubious. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/dubious/unchallengeable.

Google Ngram Viewer shows how "dubious" and "unchallengeable" have occurred on timeline