Plain
Simplex
Simplex adjective - Having only one part or element.
Plain and simplex are semantically related in simple topic. You can use "Plain" instead an adjective "Simplex", if it concerns topics such as elementary.
Mutual synonyms
Cite this Source
Simplex and Plain. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/plain/simplex
Plain & Simplex. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/plain/simplex>.
Simplex or Plain. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/plain/simplex.
Google Ngram Viewer shows how "plain" and "simplex" have occurred on timeline