| erectile(adjective, firm, straight, upright) | |
| good | |
| horizontal(adjective, smooth, solid, level, true) | |
| downright | |
| flat | |
| level | |
| linear | |
| longitudinal | |
| on end(expression, adjective, idiom, straight, upright) | |
| orthogonal | |
| orthostatic | |
| rearing | |
| standing up(verb, adjective, phrasal verb, verticality) | |
| straight-up(adjective, sharp, straight, upright, erect) | |
| support(upright, post) | |
| unbent | |
| upward(adjective, straight, upright, erect, perpendicular) | |
| true | |
| bluff | |
| bolt upright(adjective, upright) |
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| APA | Smart Define. (2016). vertical thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/vertical/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "vertical thesaurus" https://smartdefine.org/vertical/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2016, vertical thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/vertical/thesaurus/synonyms>. |
| MLA | Smart Define. "vertical thesaurus" 15 March 2016. Web. 20 September 2026. <https://smartdefine.org/vertical/thesaurus/synonyms> |