308 entries under straightforward topic. ×

5
effortless(adjective, quiet, clear, light, smooth)
5
literal(adjective, simple, honest, exact, pure)
5
primary(adjective, simple, pure, basic)
5
sober(adjective, calm, dull, tough, soft)
5
stale(adjective, dull, weak, simple, flat)
5
true(adjective, good, clear, open, simple)
5
unfeigned(adjective, good, open, simple, easy)
5
unimaginative(adjective, dull, simple, tough, flat)
5
unstudied(adjective, open, simple, reasonable, easy)
5
vapid(adjective, dull, weak, simple, flat)
4
aboveboard(open, honest, sincere, genuine)
4
actual(adjective, open, simple, right, honest)
4
dead(adjective, dull, simple, soft, obscure)
4
elemental(adjective, simple, pure, basic)
4
fair(adjective, good, open, simple, reasonable)
4
humdrum(adjective, dull, weak, simple, flat)
4
limpid(adjective, clear, simple, clean, thin)
4
moderate(adjective, calm, light, simple, soft)
4
monotonous(adjective, dull, quiet, weak, simple)
4
open and shut(expression, adjective, idiom, clear, simple)
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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>