132 entries under natural topic. ×

5
unelaborate(adjective, simple, clean, pure, ordinary)
5
unfeigned(adjective, good, open, simple, easy)
5
unstudied(adjective, open, simple, reasonable, easy)
4
actual(adjective, open, simple, right, honest)
4
classic(adjective, simple, clean, pure, modest)
4
general(adjective, friendly, appropriate, common, ordinary)
4
open and shut(expression, adjective, idiom, clear, simple)
4
stock(adjective, good, simple, flat, common)
3
banal(adjective, dull, weak, simple, unpleasant)
3
bourgeois(adjective, simple, ordinary, familiar)
3
callow(adjective, simple, straightforward, innocent)
3
inelaborate(adjective, simple, reasonable, clean, honest)
3
pure and simple(expression, adjective, idiom, simple, clean)
3
standard(noun, adjective, good, common, ordinary)
3
uncompounded(adjective, simple, clean, pure, modest)
3
undissembled(adjective, open, friendly, appropriate, honest)
3
uninvolved(adjective, clear, light, smooth, simple)
2
authentic(adjective, good, open, simple, right)
2
casual(adjective, calm, smooth, simple, easy)
2
customary(adjective, common, ordinary, usual)
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APASmart Define. (2016). plain thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/plain/thesaurus/synonyms
ChicagoSmart Define. 2016. "plain thesaurus" https://smartdefine.org/plain/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, plain thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/plain/thesaurus/synonyms>.
MLASmart Define. "plain thesaurus" 31 March 2016. Web. 27 September 2026. <https://smartdefine.org/plain/thesaurus/synonyms>