Synonyms of perpendicular
1 uprightDictionary • the perpendicular wall of sandstone
upright • He moved into an upright position.
straight • Is this picture straight?
vertical • The climber inched up a vertical wall of rock.
2 steepDictionary • a narrow, exposed beach and perpendicular cliffs
steep • a narrow, steep-sided valley
sheer • There was a sheer drop just outside my window.
precipitous • a steep, precipitous cliff
3 at right anglesDictionary • The left wing dipped until it was perpendicular to the ground.
at right angles
at 90 degrees
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precipitousA precipitous slope or drop is very steep and often dangerous.
• a steep, precipitous cliff
sheerA sheer cliff or drop is extremely steep or completely vertical.
• There was a sheer drop just outside my window.
steepA steep slope rises at a very sharp angle and is difficult to go up.
• a narrow, steep-sided valley
Thesaurus for perpendicular from the Collins English Thesaurus
at right angles to a horizontal plane