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

But the team found that the satellite galaxy has a gravitational pull, perpendicular to Andromeda, that changes the Milky Way’s motion enough to reduce the chance of a merger between the two giant galaxies. —Ashley Strickland, CNN Money, 2 June 2025

At one point, Cortez slows his pickup down on the freeway and pulls it to a stop perpendicular to lanes of traffic. —Caleb Lunetta, San Diego Union-Tribune, 14 May 2025

Plus, sitting catty-corner with the original Courrèges store on a shopping street perpendicular to luxury shopping artery Avenue Montaigne and a stone’s throw from the Champs-Élysées, the store is ideally placed to draw a more international clientele to Molli’s doorstep. —Lily Templeton, Footwear News, 29 Apr. 2025

With Earth’s axis perpendicular to the sun, a unique interaction between solar wind and Earth's magnetosphere weakens Earth’s magnetic field slightly. —Jamie Carter, Forbes, 17 Mar. 2025