69 entries under adjective topic. ×
| vertical(noun, smooth, sharp, solid) | |
| erect(verb, smooth, sharp, solid) | |
| steep(sharp, course, extreme, straight) | |
| upright(noun, adverb, smooth, solid) | |
| plumb(smooth, solid, short, straight) | |
| straight(direct, right, level, straight) | |
| orthogonal(verticality, perpendicularity) | |
| sheer(smooth, sharp, solid, level) | |
| precipitous(smooth, sharp, solid, level) | |
| normal | |
| horizontal | |
| up-and-down(upright, variable, steep, vertical) | |
| standing(verb, firm, straight, upright) | |
| abrupt(sharp, course, quick, upright) | |
| stand-up(straight, upright, erect, vertical) | |
| upstanding(firm, straight, upright, erect) | |
| right | |
| straight-up(sharp, course, straight, upright) | |
| bluff | |
| direct |
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| APA | Smart Define. (2015). perpendicular thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/perpendicular/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "perpendicular thesaurus" https://smartdefine.org/perpendicular/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, perpendicular thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/perpendicular/thesaurus/synonyms>. |
| MLA | Smart Define. "perpendicular thesaurus" 13 April 2015. Web. 23 September 2026. <https://smartdefine.org/perpendicular/thesaurus/synonyms> |