No and Really

No

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

Really is an antonym for no.

Really

Really adverb - In actual fact.

No is an antonym for really.

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