Simple
Simple adjective - Free from all additions or embellishment.
Single is a synonym for simple in uncluttered topic. In some cases you can use "Single" instead an adjective "Simple", when it comes to topics like non-compound.
Cite this Source
Single and Simple. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/simple/single
Simple & Single. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/simple/single>.
Single or Simple. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/simple/single.
Google Ngram Viewer shows how "simple" and "single" have occurred on timeline