76 entries under smooth topic. ×
| procumbent(adjective, flat, low, level) | |
| upright(adjective, solid, level, true) | |
| vertical(adjective, solid, level, true) | |
| aligned(adjective, calm, flat, plain) | |
| balanced(adjective, calm, direct, right) | |
| calm(adjective, flat, plain, level) | |
| erect(verb, adjective, solid, level) | |
| linear(adjective, right, solid, level) | |
| plumb(adjective, direct, right, flat) | |
| steady(adjective, calm, quiet, right) | |
| undeviating(adjective, quiet, direct, right) | |
| alike(adjective, calm, direct, right) | |
| continuous(adjective, calm, quiet, direct) | |
| dead flat(expression, adjective, flat, even) | |
| in line(expression, adjective, idiom, calm) | |
| invariable(adjective, quiet, soft, gentle) | |
| matching(adjective, calm, direct, right) | |
| planate(adjective, calm, quiet, direct) | |
| reclining(adjective, low, level, lying) | |
| rolled(adjective, calm, flat, plain) |
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| APA | Smart Define. (2015). horizontal thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/horizontal/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "horizontal thesaurus" https://smartdefine.org/horizontal/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, horizontal thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/horizontal/thesaurus/synonyms>. |
| MLA | Smart Define. "horizontal thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/horizontal/thesaurus/synonyms> |