Mysterious
Mysterious adjective - Being beyond one's powers to know, understand, or explain.
Usage example: the huge stone statues on Easter Island are ancient, mysterious, and haunting
Nearby Words: mystery, mysteriously
Plain
Plain adjective - Not subject to misinterpretation or more than one interpretation.
Usage example: let me make my meaning plain
Mysterious is an antonym for plain.
Both words in one sentence
- Many of them have replaced humans in jobs (whether they be barbers, cashiers, pianists or plain guards.) This is because they replace the people who died long ago to a mysterious disease.
Source: Video Game / Puppetshow - The third in Lost Town is just plain abandoned with the robots replacing human jobs when a mysterious disease hit them years ago.
Source: Video Game / Puppetshow -
Masters has the idea to wrap it under a plain brown paper to elicit curiosity from the public as something mysterious, illicit.
Source: Series / Masters of Sex
Cite this Source
Plain and Mysterious. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/mysterious/plain
Mysterious & Plain. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/mysterious/plain>.
Plain or Mysterious. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/mysterious/plain.
Google Ngram Viewer shows how "mysterious" and "plain" have occurred on timeline