75 entries under smooth topic. ×

7
unchanging(adjective, right, flat, level)
6
undeviating(adjective, quiet, direct, right)
5
flush(adjective, calm, quiet, direct)
4
plane(adjective, calm, quiet, direct)
4
true(adjective, direct, right, flat)
3
alike(adjective, calm, direct, right)
3
equable(adjective, calm, quiet, soft)
2
balanced(adjective, calm, direct, right)
2
flowing(graceful, operating, sinuous)
2
horizontal(adjective, calm, quiet, direct)
2
in line(expression, adjective, calm, flat)
2
linear(adjective, right, solid, level)
2
matching(adjective, calm, direct, right)
2
parallel(adjective, calm, direct, right)
2
plain(adjective, calm, quiet, soft)
2
planate(adjective, calm, quiet, direct)
2
right(adjective, direct, flat, solid)
2
same(adjective, calm, direct, right)
2
unfluctuating(adjective, calm, direct, right)
1
akin(adjective, calm, flat, plain)
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APASmart Define. (2015). continuous thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/continuous/thesaurus/synonyms
ChicagoSmart Define. 2015. "continuous thesaurus" https://smartdefine.org/continuous/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, continuous thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/continuous/thesaurus/synonyms>.
MLASmart Define. "continuous thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/continuous/thesaurus/synonyms>