125 entries under open topic. ×

4
plainspoken(adjective, easy, honest, straightforward)
3
laid-back(adjective, calm, quiet, simple)
3
truthful(adjective, free, honest, fair)
3
undissembled(adjective, friendly, appropriate, honest)
3
unpolished(adjective, simple, easy, bare)
3
upfront(adjective, honest, fair, proper)
2
authentic(adjective, good, simple, right)
2
just(adjective, good, honest, fair)
2
lay it on the line(expression, adjective, idiom, good)
2
no-nonsense(adjective, calm, honest, true)
2
on the level(expression, adjective, idiom, good)
2
primitive(adjective, simple, easy, straightforward)
2
provincial(adjective, smooth, simple, easy)
2
scrupulous(free, honest, fair, straightforward)
2
simplehearted(adjective, smooth, simple, easy)
2
uncontrived(adjective, smooth, simple, easy)
2
undesigning(adjective, simple, easy, honest)
2
unlabored(adjective, smooth, simple, easy)
2
unrestricted(adjective, direct, free, easy)
2
unschooled(adjective, simple, easy, honest)
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APASmart Define. (2016). plain thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/plain/thesaurus/synonyms
ChicagoSmart Define. 2016. "plain thesaurus" https://smartdefine.org/plain/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, plain thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/plain/thesaurus/synonyms>.
MLASmart Define. "plain thesaurus" 31 March 2016. Web. 22 September 2026. <https://smartdefine.org/plain/thesaurus/synonyms>