perpendicular, plumb, upright, upward, erect, on end, cocked up, straight up.
"vertical." YourDictionary, n.d. Web. 01 February 2019. <https://thesaurus.yourdictionary.com/VERTICAL>.
vertical. (n.d.). Retrieved February 01st, 2019, from https://thesaurus.yourdictionary.com/VERTICAL
At right angles to the horizon or to level ground:
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