Questionable and Unchallengeable

Opposite meaning words

Questionable adjective - Open to question or dispute.

Usage example: whether it will rain today or not is questionable

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Unchallengeable is an antonym for questionable.

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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Questionable is an antonym for unchallengeable.

Nearby Word: unchallenged

Cite this Source

Unchallengeable and Questionable. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/questionable/unchallengeable

Questionable & Unchallengeable. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/questionable/unchallengeable>.

Unchallengeable or Questionable. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/questionable/unchallengeable.

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