Synonyms of 'perpendicular'
1 uprightDictionary, straight, vertical
the perpendicular wall of sandstone
2 steepDictionary, sheer, precipitous
a narrow, exposed beach and perpendicular cliffs
3 at right anglesDictionary, at 90 degrees
The left wing dipped until it was perpendicular to the ground.
at right angles
at 90 degrees
Copyright © 2016 by HarperCollins Publishers. All rights reserved.
A precipitous slope or drop is very steep and often dangerous.
a steep, precipitous cliff
A sheer cliff or drop is extremely steep or completely vertical.
There was a sheer drop just outside my window.
Thesaurus for perpendicular from the Collins English Thesaurus
A perpendicular line or surface points straight up, rather than being sloping or horizontal.