150 entries under plain topic. ×

6
unadulterated(adjective, complete, simple, sharp, clean)
6
unalloyed(adjective, complete, simple, bright, clean)
6
balmy(adjective, calm, weak, smooth, soft)
6
conclusive(adjective, certain, definite, valid)
6
correct(noun, verb, perfect, exact)
6
lucent(adjective, sharp, bright, straightforward)
6
marked(adjective, exact, obvious, visible)
6
out-and-out(adjective, complete, flat, clean, total)
6
undiluted(adjective, simple, bright, clean)
5
bland(adjective, weak, smooth, soft, gentle)
5
easy as pie(expression, adjective, idiom, quiet, smooth)
5
facile(adjective, light, free, smooth, simple)
5
flat(adjective, adverb, weak, smooth, gentle)
5
frank(noun, adjective, open, free, easy)
5
neat(adjective, simple, pleasant, sharp, bright)
5
open-and-shut(adjective, simple, straightforward, obvious)
5
plenary(adjective, simple, bright, clean, total)
5
undoubted(adjective, hard, sound, firm)
5
unmixed(adjective, simple, clean, wholesome)
4
classic(adjective, simple, bright, clean)
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APASmart Define. (2016). clear thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/clear/thesaurus/synonyms
ChicagoSmart Define. 2016. "clear thesaurus" https://smartdefine.org/clear/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, clear thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/clear/thesaurus/synonyms>.
MLASmart Define. "clear thesaurus" 31 March 2016. Web. 22 September 2026. <https://smartdefine.org/clear/thesaurus/synonyms>