7 entries under solid topic. ×

34
upright(noun, adjective, adverb, smooth)
28
perpendicular(noun, adjective, smooth, sharp)
22
erect(verb, adjective, smooth, sharp)
14
plumb(adjective, smooth, level, true)
11
sheer(adjective, smooth, sharp, level)
5
precipitous(adjective, smooth, right, sharp)
3
horizontal(adjective, smooth, level, true)
10 years ago|11k views|share |citing 
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>