Cool
Mutual synonyms
Both words in one sentence
- Aqua from Kingdom Hearts falls somewhere between this and Cool Big Sis, since she can be affectionate and informal or ladylike and serious based on the situation.
Source: Onee-sama - Also, the term 'Anego' - a more informal version of 'oneesan' with Cool Big Sis overtones - is strongly associated with Kurugaya, who often refers to herself by the term and insists that Haruka calls her that way.
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Miura being a Cool Big Sis is averted with a lampshade: when she asks Yotsuba to be quiet so "nee-san" (a polite, informal address for a "big sister" figure) can study, Yotsuba laughs at the idea of calling her that.
Source: Manga / Yotsuba&!
Cite this Source
Informal and Cool. (2016). Retrieved 2026, August 02, from https://thesaurus.plus/related/cool/informal
Cool & Informal. N.p., 2016. Web. 02 Aug. 2026. <https://thesaurus.plus/related/cool/informal>.
Informal or Cool. 2016. Accessed August 02, 2026. https://thesaurus.plus/related/cool/informal.
Google Ngram Viewer shows how "cool" and "informal" have occurred on timeline