Plain
True
True adjective - Free from any intent to deceive or impress others.
Usage example: may our love for one another always be true
Mutual synonyms
Both words in one sentence
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True to form, no one recognizes their similarities (possibly because no one thinks such "plain" kids could ever be similar).
Source: Western Animation / Supernoobs - Invented by king Khalla Makhun the Furry, as he blended Plain and True Magic in an attempt to prolong his life.
Source: Literature / Labyrinths of Echo - Aralorn, the heroine, is rather plain in her true form, and usually walks around like that, when she's not on a mission as spy.
Cite this Source
True and Plain. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/plain/true
Plain & True. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/plain/true>.
True or Plain. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/plain/true.
Google Ngram Viewer shows how "plain" and "true" have occurred on timeline