Certainly
Rather
Rather adverb - By choice or preference.
Mutual synonyms
Both words in one sentence
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He was rather brutal in real life, and certainly didn't care about whether he was doing the right thing or not.
Source: Historical Hero Upgrade -
Shields won't help, either, but not because it'll punch right through (though it certainly could), but rather because it bypasses them entirely.
Source: Wave Motion Gun - Comments: Yes, they certainly do make the best of the situation the brothers are in, but the point is not anything naughty, but rather that they do indeed complement each other quite well.
Cite this Source
Rather and Certainly. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/certainly/rather
Certainly & Rather. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/certainly/rather>.
Rather or Certainly. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/certainly/rather.
Google Ngram Viewer shows how "certainly" and "rather" have occurred on timeline