1 Higher doses can cause impairment of memory, judgment and coordination, irritability, paranoia,3 and suicidal thoughts. Some people experience the opposite of the intended effect, such as agitation or aggression.
Adj. 1. vertical-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. perpendicular.
perpendicular. 1  at right angles to a given plane or line. 2  exactly upright; vertical; straight up or down. 3  very steep. 4  of or designating the third and latest style of English Gothic architecture of the 14th to the 16th cent., characterized by vertical lines in its tracery.oun. 1  Mathematics A line or plane perpendicular to a given line or plane. 2  A perpendicular position. 3  A device, such as a plumb line, that is used in marking the vertical from a given point.