| silky(adjective, quiet, soft, gentle, flat) | |
| sit down(verb, phrasal verb, depression, horizontality) | |
| sleek(adjective, quiet, soft, gentle, flat) | |
| smoothed out | |
| smoothened | |
| soft(adjective, quiet, gentle, flat, level) | |
| soothing(adjective, quiet, soft, gentle, flat) | |
| sphere | |
| square(direct, smooth, right, flat, solid) | |
| squashed | |
| squashed flat | |
| steppe | |
| still(adjective, quiet, soft, gentle, flat) | |
| straight-cut | |
| straight-front | |
| straight-side | |
| straight ahead(expression, adjective, direct, right, true) | |
| straightaway(adjective, direct, right, true, straight) | |
| streamlined | |
| stretched out |
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| APA | Smart Define. (2015). horizontal thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/horizontal/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "horizontal thesaurus" https://smartdefine.org/horizontal/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, horizontal thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/horizontal/thesaurus/synonyms>. |
| MLA | Smart Define. "horizontal thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/horizontal/thesaurus/synonyms> |