Plain
Plain adjective - Free from added matter.
Usage example: I'd prefer my pasta plain, not flavored with tomato or spinach or anything else
Unadulterated is a synonym for plain in clean topic. In some cases you can use "Unadulterated" instead an adjective "Plain".
Unadulterated
Unadulterated adjective - Free from added matter.
Usage example: an unadulterated solution is required for the experiment
Plain is a synonym for unadulterated in clean topic. Sometimes you can use "Plain" instead an adjective "Unadulterated".
Mutual synonyms
Cite this Source
Unadulterated and Plain. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/plain/unadulterated
Plain & Unadulterated. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/plain/unadulterated>.
Unadulterated or Plain. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/plain/unadulterated.
Google Ngram Viewer shows how "plain" and "unadulterated" have occurred on timeline