| dull | |
| earth | |
| easy(adjective, quiet, soft, gentle, flat) | |
| effortless(adjective, quiet, soft, gentle, flat) | |
| equable(adjective, calm, quiet, smooth, soft) | |
| equivalent(adjective, calm, smooth, flat, plain) | |
| esplanade | |
| exact(adjective, calm, smooth, flat, plain) | |
| flatland | |
| flattened | |
| fluent(adjective, quiet, soft, gentle, flat) | |
| fluid(adjective, quiet, soft, gentle, flat) | |
| frictionless(adjective, quiet, soft, gentle, flat) | |
| glassy(adjective, quiet, soft, gentle, flat) | |
| grade | |
| ground | |
| growing along the ground(expression, idiom, spreading, climbing) | |
| hairless(adjective, quiet, soft, gentle, flat) | |
| homaloid | |
| homaloidal |
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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> |