Plain
Mutual synonyms
Both words in one sentence
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No Accounting for Taste: Wakana's friends just can't see why Wakana is interested in plain boys, and they aren't sure if Wakana and Kagano are right for each other.
Source: Manga / Plain Love - Though, if she must be called Anne, she's sure to remind you that it's spelled with an E, because without it, it looks even more plain and dreadful.
Source: Special Person, Normal Name - In-universe, nobody is exactly sure what Garak (plain, simple Garak) can accomplish.
Source: Memetic Badass / Live-Action TV
Cite this Source
Sure and Plain. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/plain/sure
Plain & Sure. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/plain/sure>.
Sure or Plain. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/plain/sure.
Google Ngram Viewer shows how "plain" and "sure" have occurred on timeline