Plain
Plain adjective - Free from all additions or embellishment.
Trustworthy and plain are semantically related. In some cases you can use "Trustworthy" instead an adjective "Plain".
Trustworthy
Trustworthy adjective - Worthy of one's trust.
Plain and trustworthy are semantically related. Sometimes you can use "Plain" instead an adjective "Trustworthy".
Mutual synonyms
Both words in one sentence
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Devil in Plain Sight: Comically inverted; Iznogood looks, acts and IS definitely Obviously Evil, and people of Bagdad are perfectly aware of his desire to overthrow the Caliph... but the Caliph himself never suspects a thing, instead seeing Iznogoud as a devoted, good, trustworthy friend.
Source: Comic Book / Iznogoud
Cite this Source
Trustworthy and Plain. (2016). Retrieved 2026, July 28, from https://thesaurus.plus/related/plain/trustworthy
Plain & Trustworthy. N.p., 2016. Web. 28 Jul. 2026. <https://thesaurus.plus/related/plain/trustworthy>.
Trustworthy or Plain. 2016. Accessed July 28, 2026. https://thesaurus.plus/related/plain/trustworthy.
Google Ngram Viewer shows how "plain" and "trustworthy" have occurred on timeline