is similar to
extremely steep
"an abrupt canyon"; "the precipitous rapids of the upper river"; "the precipitous hills of Chinese paintings"; "a sharp drop"
is similar to
very steep; having a prominent and almost vertical front
"a bluff headland"; "where the bold chalk cliffs of England rise"; "a sheer descent of rock"
is similar to
sharply inclined
"a heavy grade"
is similar to
extremely steep
"the great perpendicular face of the cliff"
is similar to
somewhat steep
is similar to
having very steep sides
see also
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"