125 entries under open topic. ×

13
unsophisticated(adjective, simple, easy, honest)
12
overt(adjective, clear, obvious, artless)
11
bald(adjective, direct, simple, honest)
11
easy(adjective, quiet, clear, light)
11
guileless(adjective, direct, free, simple)
11
homey(adjective, quality, simple, easy)
11
outright(adjective, good, clear, direct)
11
rustic(adjective, simple, easy, clean)
11
unaffected(adjective, simple, tough, reasonable)
11
unqualified(adjective, clear, right, friendly)
10
genuine(adjective, good, simple, right)
10
unconcealed(adjective, clear, direct, free)
10
undisguised(adjective, good, clear, free)
9
familiar(adjective, dull, free, simple)
9
unreserved(adjective, clear, direct, free)
8
innocent(adjective, simple, easy, friendly)
8
matter-of-fact(adjective, direct, free, simple)
7
blatant(adjective, clear, flat, total)
7
bluff(adjective, honest, straightforward, blunt)
7
unrestrained(adjective, simple, warm, loving)
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APASmart Define. (2016). plain thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/plain/thesaurus/synonyms
ChicagoSmart Define. 2016. "plain thesaurus" https://smartdefine.org/plain/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, plain thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/plain/thesaurus/synonyms>.
MLASmart Define. "plain thesaurus" 31 March 2016. Web. 23 September 2026. <https://smartdefine.org/plain/thesaurus/synonyms>