167 entries under adjective topic. ×

4
parallel(calm, direct, smooth, right)
4
plain(calm, quiet, smooth, soft)
4
procumbent(smooth, flat, low, level)
4
tabular
4
upright(smooth, solid, level, true)
3
vertical(smooth, solid, level, true)
3
aligned(calm, smooth, flat, plain)
3
balanced(calm, direct, smooth, right)
3
calm(smooth, flat, plain, level)
3
erect(verb, smooth, solid, level)
3
linear(smooth, right, solid, level)
3
lying down(expression, lying)
3
perpendicular
3
planar(flat, even)
3
plumb(direct, smooth, right, flat)
3
steady(calm, quiet, smooth, right)
3
transverse
3
undeviating(quiet, direct, smooth, right)
2
alike(calm, direct, smooth, right)
2
bland(quiet, soft, gentle, flat)
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APASmart Define. (2015). horizontal thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/horizontal/thesaurus/synonyms
ChicagoSmart Define. 2015. "horizontal thesaurus" https://smartdefine.org/horizontal/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, horizontal thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/horizontal/thesaurus/synonyms>.
MLASmart Define. "horizontal thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/horizontal/thesaurus/synonyms>