Indubitable and Questionable

Opposite meaning words

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

Usage example: the indubitable fact that there are no more woolly mammoths or saber-toothed tigers around

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Questionable is an antonym for indubitable.

Nearby Word: indubitably

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

Usage example: the runner's unexpected first-place finish is questionable, so a drug test has been ordered

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Indubitable is an antonym for questionable.

Cite this Source

Questionable and Indubitable. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/indubitable/questionable

Indubitable & Questionable. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/indubitable/questionable>.

Questionable or Indubitable. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/indubitable/questionable.

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