| arrowlike | |
| aslant | |
| beeline(adjective, smooth, right, solid, level) | |
| billiard table | |
| bowling green | |
| clear | |
| commensurate(adjective, calm, smooth, flat, plain) | |
| common(adjective, calm, smooth, flat, plain) | |
| comparable(adjective, calm, smooth, flat, plain) | |
| consistent(adjective, calm, direct, smooth, right) | |
| constant(adjective, calm, smooth, right, flat) | |
| couch(depression, horizontality) | |
| crabwise | |
| creamy(adjective, quiet, soft, gentle, flat) | |
| crosswise | |
| dead level | |
| dead straight | |
| deliberate | |
| depressed | |
| diagonal |
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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> |