Infallible and Questionable
Opposite meaning words
Infallible
Infallible adjective - Not likely to fail.
Usage example: an infallible cure for hiccups
Questionable is an antonym for infallible.
Nearby Words: infallibly, infallibility
Questionable
Questionable adjective - Giving good reason for being doubted, questioned, or challenged.
Infallible is an antonym for questionable.
Cite this Source
Questionable and Infallible. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/infallible/questionable
Infallible & Questionable. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/infallible/questionable>.
Questionable or Infallible. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/infallible/questionable.
Google Ngram Viewer shows how "infallible" and "questionable" have occurred on timeline