Questionable and Undoubtful

Opposite meaning words

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

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Undoubtful is an antonym for questionable.

Definitions of Questionable not found.

Questionable is an antonym for undoubtful in confident topic.

Cite this Source

Undoubtful and Questionable. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/questionable/undoubtful

Questionable & Undoubtful. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/questionable/undoubtful>.

Undoubtful or Questionable. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/questionable/undoubtful.

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