Vertical Thesaurus / Antonyms

25	horizontal(adjective, flat)
4	inclined
3	flat
2	prostrate(adjective, flat, horizontal)
2	unerect
2	aslant
2	level(adjective, rough, irregular, broken, indefinite)
1	diagonal
1	prone
1	aslope
1	atilt
1	canted
1	crosswise
1	high-pitched
1	leaning
1	low-pitched
1	monoclinal
1	naiant
1	nonhierarchical
0	parallel

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APA	Smart Define. (2016). vertical thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/vertical/thesaurus/antonyms
Chicago	Smart Define. 2016. "vertical thesaurus" https://smartdefine.org/vertical/thesaurus/antonyms (accessed September 22, 2026).
Harvard	Smart Define 2016, vertical thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/vertical/thesaurus/antonyms>.
MLA	Smart Define. "vertical thesaurus" 15 March 2016. Web. 22 September 2026. <https://smartdefine.org/vertical/thesaurus/antonyms>

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