Certainly
Dead sure
Certainly and dead sure are semantically related in definitely topic. You can use "Certainly" instead an adverb phrase "Dead sure".
Mutual synonyms
Cite this Source
Dead sure and Certainly. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/certainly/dead_sure
Certainly & Dead sure. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/certainly/dead_sure>.
Dead sure or Certainly. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/certainly/dead_sure.
Google Ngram Viewer shows how "certainly" and "dead sure" have occurred on timeline