Plain
Plain adjective - Free from all additions or embellishment.
Smooth is a synonym for plain in characteristic topic. In some cases you can use "Smooth" instead an adjective "Plain", when it comes to topics like flat.
Both words in one sentence
- Esau is described as red and hairy, and Jacob, as plain and smooth-skinned.
Source: Always Identical Twins -
However, they healed so that her skin lies smooth, and Jerin finds the scars attractive, giving her plain face boldness and character.
Source: Good Scars, Evil Scars - If you have a smooth-talking Cajun card shark who can "charge" ordinary objects into explosive devices, that's probably just plain Gambit.
Source: Gambit Index
Cite this Source
Smooth and Plain. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/plain/smooth
Plain & Smooth. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/plain/smooth>.
Smooth or Plain. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/plain/smooth.
Google Ngram Viewer shows how "plain" and "smooth" have occurred on timeline