Dubious and Questionless
Opposite meaning words
Dubious
Dubious adjective - Giving good reason for being doubted, questioned, or challenged.
Usage example: any letter bearing the signature of Geronimo would be of dubious authenticity, to say the least
Questionless is an antonym for dubious.
Questionless
Cite this Source
Questionless and Dubious. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/dubious/questionless
Dubious & Questionless. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/dubious/questionless>.
Questionless or Dubious. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/dubious/questionless.
Google Ngram Viewer shows how "dubious" and "questionless" have occurred on timeline