Fundamental
Fundamental adjective - Of or relating to the simplest facts or theories of a subject.
Plain and fundamental are semantically related. In some cases you can use "Plain" instead an adjective "Fundamental".
Plain
Plain adjective - Free from all additions or embellishment.
Fundamental and plain are semantically related. Sometimes you can use "Fundamental" instead an adjective "Plain".
Both words in one sentence
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Fabio's fundamental flaw (and undoing) as a competitor is that he just plain doesn't understand American-influenced food.
Source: Series / Top Chef -
More proof that, regardless of the fundamental differences in our respective cultural mores, the Japanese are just plain nuts: It's Russian Roulette for kids!
Source: Russian Roulette
Cite this Source
Plain and Fundamental. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/fundamental/plain
Fundamental & Plain. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/fundamental/plain>.
Plain or Fundamental. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/fundamental/plain.
Google Ngram Viewer shows how "fundamental" and "plain" have occurred on timeline