Definitely and No

Definitely

Definitely adverb - Without any question.

No is an antonym for definitely.

No

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

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