Synonyms of perpendicular

perpendicular

adjective

ˌpər-pən-ˈdi-kyə-lər 

as in vertical

rising straight up

river rafters staring awestruck at the canyon's nearly perpendicular cliffs

Synonyms & Similar Words

• vertical
• standing
• erect
• upright
• plumb
• lifted
• raised
• upstanding
• upraised
• elevated
• stand-up
• upended
• freestanding
• stand-alone
• semierect

Antonyms & Near Antonyms

• flat
• recumbent
• diagonal
• prostrate
• supine
• hanging
• slant
• sagging
• slanted
• slanting
• slanty

Synonym Chooser

How does the adjective perpendicular differ from other similar words?

The words plumb and vertical are common synonyms of perpendicular. While all three words mean "being at right angles to a base line," perpendicular may stress the straightness of a line making a right angle with any other line, not necessarily a horizontal one.

the parallel bars are perpendicular to the support posts

When is plumb a more appropriate choice than perpendicular?

While in some cases nearly identical to perpendicular, plumb stresses an exact verticality determined (as with a plumb line) by earth's gravity.

make sure that the wall is plumb

When is it sensible to use vertical instead of perpendicular?

While the synonyms vertical and perpendicular are close in meaning, vertical suggests a line or direction rising straight upward toward a zenith.

the side of the cliff is almost vertical

Example Sentences

Recent Examples of perpendicular

Set them perpendicular to the wall with the trigger end against the vertical surface, or in small spaces, set two traps parallel to the wall, with the triggers facing in either direction, says Owen. —Arricca Elin Sansone, Southern Living, 30 Oct. 2025

For example, in vibrations generated at angles that were perpendicular to the web surface or perpendicular to the threads coming out from the web’s center (like the spokes on a wheel), the stabilimenta did not create noticeable changes on how the vibrations moved. —Laura Baisas, Popular Science, 29 Oct. 2025

Slice against that, perpendicular to the lines, to shorten the muscle fibers. —Robin Miller, AZCentral.com, 9 Oct. 2025

The narrow, strong currents flow quickly and perpendicular to the coastline. —Jeanine Santucci, USA Today, 20 Aug. 2025