120 entries under plain topic. ×

39
pure(adjective, feature, characteristic, good, clear)
12
simple(adjective, clear, easy, sharp)
11
modest(adjective, good, simple, right, appropriate)
10
unadulterated(adjective, simple, pure, natural)
9
open(verb, adjective, feature, characteristic, good)
9
square(adjective, feature, characteristic, good, honor)
9
uncluttered(verb, adjective, sharp, pure)
8
frank(adjective, feature, characteristic, good, honor)
8
genuine(adjective, feature, characteristic, honor, simple)
8
straightforward(adjective, feature, characteristic, good, quiet)
7
free(verb, adjective, feature, characteristic, clear)
7
sheer(adjective, simple, pure, modest)
7
stark(adjective, clear, simple, pure)
6
absolute(adjective, complete, pure, natural)
6
austere(adjective, quiet, simple, pure)
6
light(adjective, quiet, clear, smooth, easy)
6
sincere(adjective, feature, characteristic, good, honor)
5
candid(adjective, feature, characteristic, good, honor)
5
unmixed(adjective, simple, pure, modest)
4
bare(adjective, clear, simple, pure)
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APASmart Define. (2016). clean thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/clean/thesaurus/synonyms
ChicagoSmart Define. 2016. "clean thesaurus" https://smartdefine.org/clean/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, clean thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/clean/thesaurus/synonyms>.
MLASmart Define. "clean thesaurus" 29 March 2016. Web. 20 September 2026. <https://smartdefine.org/clean/thesaurus/synonyms>