218 entries under flat topic. ×

13
prairie(noun, nature, grassland, field)
12
champaign(noun, land, prairie, lowland)
12
plateau(noun, nature, level, high)
11
easy(adjective, quiet, clear, open, light)
11
out-and-out(adjective, clear, complete, simple)
11
outright(adjective, good, clear, open, direct)
11
plane(noun, adjective, characteristic, calm, quiet)
11
routine(adjective, good, dull, clear, simple)
11
smooth(adjective, characteristic, calm, clear, light)
11
unqualified(adjective, clear, open, right, friendly)
10
steppe(noun, plain, field, land)
10
undisguised(adjective, good, clear, open, free)
9
familiar(adjective, dull, open, free, simple)
9
prosaic(adjective, dull, mean, simple, tough)
8
drab(adjective, calm, dull, simple, soft)
8
field(noun, area, spread, stretch)
8
heath(noun, field, land, pasture)
8
insipid(adjective, dull, weak, simple)
8
quiet(adjective, calm, light, simple, soft)
8
run-of-the-mill(adjective, good, dull, simple)
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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>