S: (adj) atilt, canted, leaning, tilted, tipped (departing or being caused to depart from the true vertical or horizontal) "the leaning tower of Pisa"; "the headstones were tilted"
W: (adj) horizontal [Indirect via inclined] (parallel to or in the plane of the horizon or a base line) "a horizontal surface"
W: (adj) vertical [Indirect via inclined] (at right angles to the plane of the horizon or a base line) "a vertical camera angle"; "the monument consists of two vertical pillars supporting a horizontal slab"; "measure the perpendicular height"