Certain
Certain adjective - Not capable of being challenged or proved wrong.
Usage example: up to this point there's been no certain evidence that a crime has been committed
Unquestionable is a synonym for certain in known topic. In some cases you can use "Unquestionable" instead an adjective "Certain", when it comes to topics like reliable, indisputable, undeniable. popular alternative
Unquestionable
Unquestionable adjective - Not capable of being challenged or proved wrong.
Usage example: a person of unquestionable integrity
Certain is a synonym for unquestionable in definite topic. You can use "Certain" instead an adjective "Unquestionable", if it concerns topics such as reliable, sure, indisputable, undeniable. popular alternative
Mutual synonyms
Related pairs
- clear and certain
- clear and unquestionable
- fixed and certain
- fixed and unquestionable
- positive and certain
- positive and unquestionable
- true and certain
- true and unquestionable
- genuine and certain
- genuine and unquestionable
- definite and certain
- definite and unquestionable
- reliable and certain
- reliable and unquestionable
Cite this Source
Unquestionable and Certain. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/certain/unquestionable
Certain & Unquestionable. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/certain/unquestionable>.
Unquestionable or Certain. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/certain/unquestionable.
Google Ngram Viewer shows how "certain" and "unquestionable" have occurred on timeline