Find Antonyms

diagonal Antonyms

Opposite of diagonal

Pinning down the opposite of diagonal requires matching its exact sense, so the antonyms and opposite words below are paired with a clear adjective definition and ranked by contrast strength.
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• adjective (Context 1)

Joining two opposite corners of a square, rectangle, or other straight-sided shape; having a slanting or oblique direction.

Usage Example

"She drew a horizontal line across the page to divide the chart into two triangles."

Strong
horizontal
vertical
perpendicular
level

Similar words to diagonal

Words similar to diagonal shift depending on context. Common synonyms include:

oblique
slanting
slanted
catacorner
cater-cornered
angled
slant
askew
See all synonyms of diagonal

• Nearby Words

diagnostic
diagnostician
diagnostics
diagonal
diagonally
diagram
diagrammatic

Cite this Entry

Wordmom. (2026). Antonyms for Diagonal. In Wordmom Thesaurus. Retrieved Nov 5, 2026, from https://wordmom.com/antonyms/diagonal
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