Synonyms of cardinal

cardinal

adjective

as in main

coming before all others in importance

the cardinal rule of medicine: do no harm

Synonyms & Similar Words

• main
• greatest
• highest
• primary
• predominant
• dominant
• foremost
• principal
• first
• big
• chief
• central
• key
• supreme
• leading
• sovereign
• paramount
• overriding
• great
• premier
• primal
• master
• prior
• capital
• grand
• major
• number one
• distinguished
• sovran
• overbearing
• preeminent
• top
• eminent
• outstanding
• overmastering
• senior
• No. 1
• arch
• illustrious
• notable
• numero uno
• star
• noteworthy
• important
• signal
• stellar
• high-level
• prestigious
• superior
• noble
• influential
• momentous
• mighty
• famous
• incomparable
• unequalled
• significant
• celebrated
• renowned
• unequaled
• unparalleled
• famed
• matchless
• unsurpassed

Antonyms & Near Antonyms

• last
• least
• minor
• trivial
• unimportant
• insignificant
• secondary
• negligible
• slight
• subordinate
• collateral
• inferior
• inconsequential
• trifling
• inconsiderable
• subsidiary

Synonym Chooser

How is the word cardinal different from other adjectives like it?

Some common synonyms of cardinal are essential, fundamental, and vital. While all these words mean "so important as to be indispensable," cardinal suggests something on which an outcome turns or depends.

a cardinal rule in buying a home

Where would essential be a reasonable alternative to cardinal?

The meanings of essential and cardinal largely overlap; however, essential implies belonging to the very nature of a thing and therefore being incapable of removal without destroying the thing itself or its character.

conflict is essential in drama

When could fundamental be used to replace cardinal?

The words fundamental and cardinal are synonyms, but do differ in nuance. Specifically, fundamental applies to something that is a foundation without which an entire system or complex whole would collapse.

fundamental principles of algebra

When is vital a more appropriate choice than cardinal?

While in some cases nearly identical to cardinal, vital suggests something that is necessary to a thing's continued existence or operation.

cut off from vital supplies

Example Sentences

Recent Examples of cardinal

The cardinal rule of relativity is that there’s a speed limit to the Universe, the speed of light, that nothing can break. —Ethan Siegel, Big Think, 14 Aug. 2025

Never Share Sensitive Workplace Data With AI Tools The cardinal rule is simple. —Caroline Castrillon, Forbes.com, 14 Aug. 2025

It is heavily guarded because the cardinal rule of the place is that there is no violence. —Rafael Motamayor, Vulture, 7 Aug. 2025

King arrived at the event in a pair of Manolo Blahnik‘s Corintia 90mm pumps in a bright cardinal red hue, which were a flattering contrast to the cobalt blue carpet. —Karla Rodriguez, Footwear News, 3 Sep. 2019

Phrases Containing cardinal

• cardinal virtue

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