83 entries under plain topic. ×

3
precise(adjective, clear, simple, sharp)
3
self-explanatory(adjective, quiet, clear, smooth, easy)
3
smooth(adjective, quiet, clear, easy, fine)
2
accurate(adjective, clear, obvious)
2
certain(adjective, clear, obvious, unequivocal)
2
classic(adjective, simple, bright, clean)
2
clean-cut(clear, definite, obvious, well-defined)
2
crystal-clear(adjective, clear, bright, thin)
2
elementary(adjective, quiet, clear, smooth, easy)
2
neat(adjective, clear, simple, bright, clean)
2
perfect(adjective, simple, bright, clean)
2
specific(clear, straightforward, precise, obvious)
1
natural(adjective, simple, bright, clean)
1
authentic(adjective, simple, bright, clean)
1
clean(adjective, quiet, clear, smooth, easy)
1
incomplex(adjective, quiet, clear, smooth, easy)
1
mild(adjective, quiet, clear, smooth, pleasant)
1
plenary(adjective, simple, bright, clean)
1
positive(clear, obvious)
1
pure and simple(expression, adjective, idiom, simple, bright)
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APASmart Define. (2016). lucid thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/lucid/thesaurus/synonyms
ChicagoSmart Define. 2016. "lucid thesaurus" https://smartdefine.org/lucid/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, lucid thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/lucid/thesaurus/synonyms>.
MLASmart Define. "lucid thesaurus" 31 March 2016. Web. 25 September 2026. <https://smartdefine.org/lucid/thesaurus/synonyms>