No and Unquestionably

No

No adverb - Certainly not.
Usage example: in no uncertain terms we were told to leave

Unquestionably is an antonym for no.

Unquestionably

Unquestionably adverb - Without any question.
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Synonyms for Unquestionably

No is an antonym for unquestionably.

Cite this Source
Unquestionably and No. (2016). Retrieved 2026, August 09, from https://thesaurus.plus/related/no/unquestionably
No & Unquestionably. N.p., 2016. Web. 09 Aug. 2026. <https://thesaurus.plus/related/no/unquestionably>.
Unquestionably or No. 2016. Accessed August 09, 2026. https://thesaurus.plus/related/no/unquestionably.
Google Ngram Viewer shows how "no" and "unquestionably" have occurred on timeline