308 entries under straightforward topic. ×

11
uncomplicated(adjective, clear, light, smooth, simple)
11
well-defined(adjective, clear, sharp, exact)
10
genuine(adjective, good, open, simple, right)
10
undisguised(adjective, good, clear, open, free)
9
clean(adjective, clear, simple, easy, sharp)
9
prosaic(adjective, dull, mean, simple, tough)
9
unexceptional(adjective, good, simple, reasonable, common)
8
drab(adjective, calm, dull, simple, soft)
8
glaring(adjective, clear, simple, certain)
8
innocent(adjective, open, simple, easy, friendly)
8
lowly(adjective, quiet, simple, gentle, poor)
8
matter-of-fact(adjective, open, direct, free, simple)
8
naked(adjective, dull, simple, tough, rational)
8
quiet(adjective, calm, light, simple, soft)
8
self-explanatory(adjective, quiet, clear, simple, easy)
8
tangible(adjective, clear, exact, significant)
8
unadulterated(adjective, simple, clean, pure, true)
7
blatant(adjective, clear, open, flat, total)
7
bluff(adjective, open, honest, blunt)
7
fundamental(adjective, simple, pure, basic)
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APASmart Define. (2016). plain thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/plain/thesaurus/synonyms
ChicagoSmart Define. 2016. "plain thesaurus" https://smartdefine.org/plain/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, plain thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/plain/thesaurus/synonyms>.
MLASmart Define. "plain thesaurus" 31 March 2016. Web. 24 September 2026. <https://smartdefine.org/plain/thesaurus/synonyms>