4
erectile(adjective, firm, straight, upright)
4
good
3
horizontal(adjective, smooth, solid, level, true)
3
downright
3
flat
3
level
3
linear
3
longitudinal
3
on end(expression, adjective, idiom, straight, upright)
3
orthogonal
3
orthostatic
3
rearing
3
standing up(verb, adjective, phrasal verb, verticality)
3
straight-up(adjective, sharp, straight, upright, erect)
3
support(upright, post)
3
unbent
3
upward(adjective, straight, upright, erect, perpendicular)
2
true
2
bluff
2
bolt upright(adjective, upright)
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APASmart Define. (2016). vertical thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/vertical/thesaurus/synonyms
ChicagoSmart Define. 2016. "vertical thesaurus" https://smartdefine.org/vertical/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, vertical thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/vertical/thesaurus/synonyms>.
MLASmart Define. "vertical thesaurus" 15 March 2016. Web. 20 September 2026. <https://smartdefine.org/vertical/thesaurus/synonyms>